Magnetics

220 questions · Physics · JEE Main

Magnetics

220 questions · Physics · JEE Main

Let $B_{1}$ be the magnitude of magnetic field at center of a circular coil of radius $R$ carrying current I. Let $B_{2}$ be the magnitude of magnetic field at an axial distance ' $x$ ' from the center. For $x : R = 3 : 4, \frac{B _{2}}{B _{1}}$ …2025 · 2 Apr · Shift 1 · Q56 · MCQ
In a moving coil galvanometer, two moving coils $M_{1}$ and $M_{2}$ have the following particulars : $R_{1} = 5Ω, N_{1} = 15, A_{1} = 3.6 \times 1 0^{- 3} m^{2}, B_{1} = 0.25 T R_{2} = 7Ω, N_{2} = 21, A_{2} = 1.8 \times 1 0^{- 3} m^{2}, B_{2} = 0.50 T$ …2025 · 2 Apr · Shift 2 · Q52 · MCQ
A solenoid having area A and length ' $l$ ' is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is :2025 · 2 Apr · Shift 2 · Q56 · MCQ
A loop ABCDA , carrying current $I = 12 A$ , is placed in a plane, consists of two semi-circular segments of radius $R_{1} = 6 π m$ and $R_{2} = 4 π m$ . The magnitude of the resultant magnetic field… Includes diagram2025 · 3 Apr · Shift 1 · Q72 · Numerical
A 4.0 cm long straight wire carrying a current of 8 A is placed perpendicular to a uniform magnetic field of strength 0.15 T . The magnetic force on the wire is mN .2025 · 3 Apr · Shift 1 · Q75 · Numerical
Given below are two statements: one is labelled as $Assertion A$ and the other is labelled as Reason $R$ Assertion A : If Oxygen ion $(O^{- 2})$ and Hydrogen ion $(H^{+})$ …2025 · 3 Apr · Shift 2 · Q70 · MCQ
If an optical medium possesses a relative permeability of $\frac{10}{π}$ and relative permittivity of $\frac{1}{0.0885}$ , then the velocity of light is greater in vacuum than that in this medium by times. $(μ_{0} = 4 π \times 1 0^{- 7} H / m, ϵ_{0} = 8.85 \times 1 0^{- 12} F / m, c = 3 \times 1 0^{8} m / s)$ …2025 · 4 Apr · Shift 2 · Q73 · Numerical
A particle of charge $q$ , mass $m$ and kinetic energy $E$ enters in magnetic field perpendicular to its velocity and undergoes a circular arc of radius (r). Which of the following curves represents the variation of $r$ with $E$ ?2025 · 7 Apr · Shift 1 · Q57 · MCQ
Uniform magnetic fields of different strengths $(B_{1}$ and $B_{2})$ , both normal to the plane of the paper exist as shown in the figure. A charged particle of mass $m$ and charge $q$ , at the interface at an instant,… Includes diagram2025 · 7 Apr · Shift 1 · Q61 · MCQ
Figure shows a current carrying square loop ABCD of edge length is ‘a’ lying in a plane. If the resistance of the ABC part is r and that of ADC part is 2r, then the magnitude of the resultant magnetic field at centre of the square loop is Includes diagram2025 · 8 Apr · Shift 2 · Q56 · MCQ
An electron projected perpendicular to a uniform magnetic field B moves in a circle. If Bohr's quantization is applicable, then the radius of the electronic orbit in the first excited state is :2025 · 22 Jan · Shift 2 · Q56 · MCQ
A proton is moving undeflected in a region of crossed electric and magnetic fields at a constant speed of $2 \times 1 0^{5} ms^{- 1}$ . When the electric field is switched off, the proton moves along a circular path of radius 2 cm .…2025 · 22 Jan · Shift 2 · Q71 · Numerical
Two long parallel wires $X$ and $Y$ , separated by a distance of 6 cm , carry currents of 5 A and 4A, respectively, in opposite directions as shown in the figure. Magnitude of the resultant magnetic field at point P at a distance of 4 cm… Includes diagram2025 · 22 Jan · Shift 2 · Q74 · Numerical
A current of 5 A exists in a square loop of side $\frac{1}{2} m$ . Then the magnitude of the magnetic field $B$ at the centre of the square loop will be $p \times 1 0^{- 6} T$ . where, value of p is $[$ …2025 · 24 Jan · Shift 1 · Q72 · Numerical
N equally spaced charges each of value q , are placed on a circle of radius R . The circle rotates about its axis with an angular velocity $ω$ as shown in the figure. A bigger Amperian loop B encloses the whole circle where as a… Includes diagram2025 · 24 Jan · Shift 2 · Q51 · MCQ
Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A electron in a certain region of uniform magnetic field is moving with constant velocity in a straight line path.…2025 · 24 Jan · Shift 2 · Q53 · MCQ
A long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I is uniformly distributed across this cross-section. The plot of magnitude of magnetic field B with distance $r$ from the centre…2025 · 24 Jan · Shift 2 · Q59 · MCQ
A tightly wound long solenoid carries a current of 1.5 A . An electron is executing uniform circular motion inside the solenoid with a time period of 75 ns . The number of turns per metre in the solenoid is .…2025 · 24 Jan · Shift 2 · Q75 · Numerical
Consider a long thin conducting wire carrying a uniform current I. A particle having mass "M" and charge " $q$ " is released at a distance " $a$ " from the wire with a speed $v_{0}$ along the direction of current in the wire. The particle gets…2025 · 28 Jan · Shift 1 · Q60 · MCQ
An infinite wire has a circular bend of radius a, and carrying a current I as shown in the figure. The magnitude of magnetic field at the origin O of the arc is given by: Includes diagram2025 · 28 Jan · Shift 2 · Q59 · MCQ
Consider a long straight wire of a circular cross-section (radius a) carrying a steady current I. The current is uniformly distributed across this cross-section. The distances from the centre of the wire’s cross-section at which the…2025 · 29 Jan · Shift 1 · Q60 · MCQ
The magnetic field inside a 200 turns solenoid of radius 10 cm is $2.9 \times 1 0^{- 4} Tesla$ . If the solenoid carries a current of 0.29 A , then the length of the solenoid is $π cm$ .2025 · 29 Jan · Shift 2 · Q75 · Numerical
A regular polygon of 6 sides is formed by bending a wire of length $4 π$ meter. If an electric current of $4 π 3$ A is flowing through the sides of the polygon, the magnetic field at the centre of the polygon would be $x \times 1 0^{- 7} T$ …2024 · 1 Feb · Shift 1 · Q86 · Numerical
A moving coil galvanometer has 100 turns and each turn has an area of $2.0 cm^{2}$ . The magnetic field produced by the magnet is $0.01 T$ and the deflection in the coil is 0.05 radian when a current of $10 mA$ …2024 · 1 Feb · Shift 2 · Q85 · Numerical
An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :2024 · 4 Apr · Shift 1 · Q62 · MCQ
The magnetic field existing in a region is given by $B = 0.2 (1 + 2 x) \hat{k}$ . A square loop of edge $50 cm$ carrying 0.5 A current is placed in $x$ - $y$ plane with its edges parallel to the $x$ - $y$ axes, as shown in figure.… Includes diagram2024 · 4 Apr · Shift 1 · Q86 · Numerical
Two parallel long current carrying wire separated by a distance $2 r$ are shown in the figure. The ratio of magnetic field at $A$ to the magnetic field produced at $C$ is $\frac{x}{7}$ . The value of $x$ is . Includes diagram2024 · 4 Apr · Shift 2 · Q82 · Numerical
A rod of length $60 cm$ rotates with a uniform angular velocity $20 rad s^{- 1}$ about its perpendicular bisector, in a uniform magnetic filed $0.5 T$ . The direction of magnetic field is parallel to the axis of…2024 · 4 Apr · Shift 2 · Q84 · Numerical
In a co-axial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero :2024 · 5 Apr · Shift 1 · Q79 · MCQ
A 2A current carrying straight metal wire of resistance $1Ω$ , resistivity $2 \times 1 0^{- 6} Ω m$ , area of cross-section $10 mm^{2}$ and mass $500 g$ is suspended horizontally in mid air by applying a…2024 · 5 Apr · Shift 1 · Q90 · Numerical
The electrostatic force $(F_{1})$ and magnetic force $(F_{2})$ acting on a charge $q$ moving with velocity $v$ can be written :2024 · 5 Apr · Shift 2 · Q79 · MCQ
A solenoid of length $0.5 m$ has a radius of $1 cm$ and is made up of ' $m$ ' number of turns. It carries a current of $5 A$ . If the magnitude of the magnetic field inside the solenoid is $6.28 \times 1 0^{- 3} T$ …2024 · 5 Apr · Shift 2 · Q90 · Numerical
An element $Δ l = Δ x \hat{i}$ is placed at the origin and carries a large current $I = 10 A$ . The magnetic field on the $y$ -axis at a distance of $0.5 m$ from the elements $Δ x$ of $1 cm$ length is: Includes diagram2024 · 6 Apr · Shift 1 · Q76 · MCQ
A circular coil having 200 turns, $2.5 \times 1 0^{- 4} m^{2}$ area and carrying $100 μ A$ current is placed in a uniform magnetic field of $1 T$ . Initially the magnetic dipole moment $(M)$ was directed…2024 · 6 Apr · Shift 1 · Q90 · Numerical
A coil having 100 turns, area of $5 \times 1 0^{- 3} m^{2}$ , carrying current of $1 mA$ is placed in uniform magnetic field of $0.20 T$ such a way that plane of coil is perpendicular to the magnetic field. The…2024 · 6 Apr · Shift 2 · Q83 · Numerical
A square loop PQRS having 10 turns, area $3.6 \times 1 0^{- 3} m^{2}$ and resistance $100Ω$ is slowly and uniformly being pulled out of a uniform magnetic field of magnitude $B = 0.5 T$ as shown. Work done in… Includes diagram2024 · 8 Apr · Shift 1 · Q84 · Numerical
An electron with kinetic energy $5 eV$ enters a region of uniform magnetic field of 3 $μ T$ perpendicular to its direction. An electric field $E$ is applied perpendicular to the direction of velocity and…2024 · 8 Apr · Shift 1 · Q89 · Numerical
A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at $\frac{a}{2}$ and $2 a$ from axis of the wire is :2024 · 8 Apr · Shift 2 · Q61 · MCQ
Given below are two statements : Statement (I) : When currents vary with time, Newton's third law is valid only if momentum carried by the electromagnetic field is taken into account Statement (II) : Ampere's circuital law does not depend…2024 · 9 Apr · Shift 1 · Q68 · MCQ
A square loop of edge length $2 m$ carrying current of $2 A$ is placed with its edges parallel to the $x$ - $y$ axis. A magnetic field is passing through the $x$ - $y$ plane and expressed as $B = B_{0} (1 + 4 x) \hat{k}$ ,…2024 · 9 Apr · Shift 1 · Q81 · Numerical
A proton and a deutron $(q = + e, m = 2.0 u)$ having same kinetic energies enter a region of uniform magnetic field $B$ , moving perpendicular to $B$ . The ratio of the radius $r_{d}$ of deutron path to the radius…2024 · 9 Apr · Shift 2 · Q73 · MCQ
A straight magnetic strip has a magnetic moment of $44 Am^{2}$ . If the strip is bent in a semicircular shape, its magnetic moment will be $Am^{2}$ . (given $π = \frac{22}{7}$ )2024 · 9 Apr · Shift 2 · Q88 · Numerical
A proton moving with a constant velocity passes through a region of space without any change in its velocity. If $E$ and $B$ represent the electric and magnetic fields respectively, then…2024 · 27 Jan · Shift 1 · Q64 · MCQ
Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is $5.0 cm$ . The magnitude of the magnetic field at a point $P$ midway between the wires is … Includes diagram2024 · 27 Jan · Shift 1 · Q88 · Numerical
The magnetic field at the centre of a wire loop formed by two semicircular wires of radii $R_{1} = 2 π m$ and $R_{2} = 4 π m$ , carrying current $I = 4 A$ as per figure given below is $α \times 1 0^{- 7} T$ … Includes diagram2024 · 27 Jan · Shift 2 · Q87 · Numerical
Two particles $X$ and $Y$ having equal charges are being accelerated through the same potential difference. Thereafter they enter normally in a region of uniform magnetic field and describes circular paths of radii $R_{1}$ and $R_{2}$ …2024 · 29 Jan · Shift 2 · Q80 · MCQ
A charge of $4.0 μ C$ is moving with a velocity of $4.0 \times 1 0^{6} ms^{- 1}$ along the positive $y$ axis under a magnetic field $B$ of strength $(2 \hat{k}) T$ . The force acting on the charge is $x \hat{i} N$ …2024 · 29 Jan · Shift 2 · Q89 · Numerical
Two insulated circular loop A and B of radius ' $a$ ' carrying a current of ' $I$ ' in the anti clockwise direction as shown in the figure. The magnitude of the magnetic induction at the centre will be : Includes diagram2024 · 30 Jan · Shift 1 · Q75 · MCQ
The current of $5 A$ flows in a square loop of sides $1 m$ is placed in air. The magnetic field at the centre of the loop is $X 2 \times 1 0^{- 7} T$ . The value of $X$ is .2024 · 30 Jan · Shift 2 · Q83 · Numerical
A rigid wire consists of a semicircular portion of radius $R$ and two straight sections. The wire is partially immerged in a perpendicular magnetic field $B = B_{0} \hat{k}$ as shown in figure. The magnetic force on the wire if it has a… Includes diagram2024 · 31 Jan · Shift 1 · Q68 · MCQ
An electron moves through a uniform magnetic field $B = B_{0} \hat{i} + 2 B_{0} \hat{j} T$ . At a particular instant of time, the velocity of electron is $u = 3 \hat{i} + 5 \hat{j} m / s$ . If the magnetic force acting…2024 · 31 Jan · Shift 1 · Q82 · Numerical
A uniform magnetic field of $2 \times 1 0^{- 3} T$ acts along positive $Y$ -direction. A rectangular loop of sides $20 cm$ and $10 cm$ with current of $5 A$ is in $Y - Z$ plane. The current is in…2024 · 31 Jan · Shift 2 · Q65 · MCQ
Two circular coils $P$ and $Q$ of 100 turns each have same radius of $π cm$ . The currents in $P$ and $R$ are $1 A$ and $2 A$ respectively. $P$ and $Q$ are placed with their planes mutually perpendicular with their centers…2024 · 31 Jan · Shift 2 · Q84 · Numerical
Find the magnetic field at the point $P$ in figure. The curved portion is a semicircle connected to two long straight wires. Includes diagram2023 · 1 Feb · Shift 1 · Q48 · MCQ
A charge particle of $2 μ C$ accelerated by a potential difference of $100 V$ enters a region of uniform magnetic field of magnitude $4 mT$ at right angle to the direction of field. The charge particle…2023 · 1 Feb · Shift 1 · Q64 · Numerical
As shown in the figure, a long straight conductor with semicircular arc of radius $\frac{π}{10}$ m is carrying current $I = 3A$ . The magnitude of the magnetic field, at the center O of the arc is : (The permeability of the vacuum $= 4 π \times 1 0^{- 7} NA^{- 2}$ … Includes diagram2023 · 1 Feb · Shift 2 · Q60 · MCQ
A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is uniformly distributed across this cross-section. The magnetic field is2023 · 6 Apr · Shift 1 · Q53 · MCQ
Two identical circular wires of radius $20 cm$ and carrying current $2 A$ are placed in perpendicular planes as shown in figure. The net magnetic field at the centre of the circular wires is … Includes diagram2023 · 6 Apr · Shift 1 · Q65 · Numerical
A proton with a kinetic energy of $2.0 eV$ moves into a region of uniform magnetic field of magnitude $\frac{π}{2} \times 1 0^{- 3} T$ . The angle between the direction of magnetic field and velocity of proton is $6 0^{\circ}$ …2023 · 6 Apr · Shift 2 · Q69 · Numerical
A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge particle will be2023 · 8 Apr · Shift 1 · Q55 · MCQ
The ratio of magnetic field at the centre of a current carrying coil of radius $r$ to the magnetic field at distance $r$ from the centre of coil on its axis is $x : 1$ . The value of $x$ is 2023 · 8 Apr · Shift 2 · Q65 · Numerical
A straight wire carrying a current of $14 A$ is bent into a semi-circular arc of radius $2.2 cm$ as shown in the figure. The magnetic field produced by the current at the centre $(O)$ of the arc. is … Includes diagram2023 · 10 Apr · Shift 2 · Q58 · Numerical
An electron is allowed to move with constant velocity along the axis of current carrying straight solenoid. A. The electron will experience magnetic force along the axis of the solenoid. B. The electron will not experience magnetic force.…2023 · 11 Apr · Shift 2 · Q45 · MCQ
The source of time varying magnetic field may be (A) a permanent magnet (B) an electric field changing linearly with time (C) direct current (D) a decelerating charge particle (E) an antenna fed with a digital signal Choose the correct…2023 · 13 Apr · Shift 1 · Q52 · MCQ
An electron is moving along the positive $x$ -axis. If the uniform magnetic field is applied parallel to the negative z-axis, then A. The electron will experience magnetic force along positive y-axis B. The electron will experience…2023 · 13 Apr · Shift 2 · Q59 · MCQ
A straight wire $AB$ of mass $40 g$ and length $50 cm$ is suspended by a pair of flexible leads in uniform magnetic field of magnitude $0.40 T$ as shown in the figure. The magnitude of the current… Includes diagram2023 · 13 Apr · Shift 2 · Q65 · Numerical
An electron in a hydrogen atom revolves around its nucleus with a speed of $6.76 \times 1 0^{6} ms^{- 1}$ in an orbit of radius $0.52 A^{\circ}$ . The magnetic field produced at the nucleus of the hydrogen atom is …2023 · 15 Apr · Shift 1 · Q63 · Numerical
Two long straight wires P and Q carrying equal current 10A each were kept parallel to each other at 5 cm distance. Magnitude of magnetic force experienced by 10 cm length of wire P is F $_{1}$ . If distance between wires is halved and…2023 · 24 Jan · Shift 1 · Q51 · MCQ
A circular loop of radius $r$ is carrying current I A. The ratio of magnetic field at the center of circular loop and at a distance r from the center of the loop on its axis is :2023 · 24 Jan · Shift 1 · Q52 · MCQ
A long solenoid is formed by winding 70 turns cm $^{- 1}$ . If 2.0 A current flows, then the magnetic field produced inside the solenoid is ( $μ_{0} = 4 π \times 1 0^{- 7}$ TmA $^{- 1}$ )2023 · 24 Jan · Shift 2 · Q47 · MCQ
A single turn current loop in the shape of a right angle triangle with sides 5 cm, 12 cm, 13 cm is carrying a current of 2 A. The loop is in a uniform magnetic field of magnitude 0.75 T whose direction is parallel to the current in the 13…2023 · 24 Jan · Shift 2 · Q70 · Numerical
Match List I with List II Choose the correct answer from the options given below : Includes table Includes diagram2023 · 25 Jan · Shift 1 · Q51 · MCQ
For a moving coil galvanometer, the deflection in the coil is 0.05 rad when a current of 10 mA is passes through it. If the torsional constant of suspension wire is $4.0 \times 1 0^{- 5} N m ra d^{- 1}$ , the magnetic field is 0.01T and…2023 · 25 Jan · Shift 2 · Q63 · MCQ
Two long parallel wires carrying currents 8A and 15A in opposite directions are placed at a distance of 7 cm from each other. A point P is at equidistant from both the wires such that the lines joining the point P to the wires are…2023 · 25 Jan · Shift 2 · Q66 · Numerical
The magnitude of magnetic induction at mid point $O$ due to current arrangement as shown in Fig will be Includes diagram2023 · 29 Jan · Shift 1 · Q54 · MCQ
A single current carrying loop of wire carrying current I flowing in anticlockwise direction seen from +ve $z$ direction and lying in $x y$ plane is shown in figure. The plot of $\hat{j}$ component of magnetic field (By) at a… Includes diagram2023 · 29 Jan · Shift 1 · Q61 · MCQ
The electric current in a circular coil of four turns produces a magnetic induction 32 T at its centre. The coil is unwound and is rewound into a circular coil of single turn, the magnetic induction at the centre of the coil by the same…2023 · 29 Jan · Shift 2 · Q57 · MCQ
A massless square loop, of wire of resistance $10Ω$ , supporting a mass of $1 g$ , hangs vertically with one of its sides in a uniform magnetic field of $1 0^{3} G$ , directed outwards in the shaded region. A dc… Includes diagram2023 · 30 Jan · Shift 1 · Q40 · MCQ
The magnetic moments associated with two closely wound circular coils $A$ and $B$ of radius $r_{A} = 10 cm$ and $r_{B} = 20 cm$ respectively are equal if : (Where $N_{A}, I_{A}$ …2023 · 30 Jan · Shift 1 · Q52 · MCQ
As shown in the figure, a current of $2 A$ flowing in an equilateral triangle of side $43 cm$ . The magnetic field at the centroid $O$ of the triangle is (Neglect the effect of earth's magnetic field) Includes diagram2023 · 30 Jan · Shift 2 · Q58 · MCQ
A current carrying rectangular loop PQRS is made of uniform wire. The length $P R = QS = 5 cm$ and $P Q = R S = 100 cm$ . If ammeter current reading changes from I to $2 I$ , the ratio of magnetic forces per unit length on the… Includes diagram2023 · 30 Jan · Shift 2 · Q60 · MCQ
A rod with circular cross-section area $2 cm^{2}$ and length $40 cm$ is wound uniformly with 400 turns of an insulated wire. If a current of $0.4 A$ flows in the wire windings, the total magnetic flux produced…2023 · 31 Jan · Shift 1 · Q54 · MCQ
A long conducting wire having a current I flowing through it, is bent into a circular coil of $N$ turns. Then it is bent into a circular coil of $n$ turns. The magnetic field is calculated at the centre of coils in both…2023 · 31 Jan · Shift 2 · Q56 · MCQ
Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In an uniform magnetic field, speed and energy remains the same for a moving charged particle. Reason (R) : Moving…2022 · 24 Jun · Shift 1 · Q45 · MCQ
The magnetic field at the centre of a circular coil of radius r, due to current I flowing through it, is B. The magnetic field at a point along the axis at a distance $\frac{r}{2}$ from the centre is :2022 · 24 Jun · Shift 1 · Q60 · MCQ
A proton, a deutron and an $α$ -particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic field. The ratio of the radii of their respective circular paths is :2022 · 24 Jun · Shift 2 · Q53 · MCQ
Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion. If the ratio of radii of their circular paths is $6 : 5$ and their respective masses ratio is $9 : 4$ …2022 · 25 Jul · Shift 1 · Q51 · MCQ
A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r…2022 · 25 Jun · Shift 1 · Q53 · MCQ
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of magnetic field will be equal to2022 · 25 Jun · Shift 2 · Q56 · MCQ
A charge particle is moving in a uniform magnetic field $(2 \hat{i} + 3 \hat{j}) T$ . If it has an acceleration of $(α \hat{i} - 4 \hat{j}) m / s^{2}$ , then the value of $α$ will be :2022 · 26 Jul · Shift 1 · Q51 · MCQ
$B_{X}$ and $B_{Y}$ are the magnetic fields at the centre of two coils $X$ and $Y$ respectively each carrying equal current. If coil $X$ has 200 turns and $20 cm$ radius and coil $Y$ …2022 · 26 Jul · Shift 1 · Q52 · MCQ
Two concentric circular loops of radii $r_{1} = 30 cm$ and $r_{2} = 50 cm$ are placed in $X - Y$ plane as shown in the figure. A current $I = 7 A$ is flowing through them in the direction as shown in… Includes diagram2022 · 26 Jul · Shift 2 · Q54 · MCQ
A proton and an alpha particle of the same velocity enter in a uniform magnetic field which is acting perpendicular to their direction of motion. The ratio of the radii of the circular paths described by the alpha particle and proton is :2022 · 26 Jun · Shift 1 · Q54 · MCQ
Two 10 cm long, straight wires, each carrying a current of 5A are kept parallel to each other. If each wire experienced a force of 10 $-$ 5 N, then separation between the wires is cm.2022 · 26 Jun · Shift 2 · Q69 · Numerical
A cyclotron is used to accelerate protons. If the operating magnetic field is $1.0 T$ and the radius of the cyclotron 'dees' is $60 cm$ , the kinetic energy of the accelerated protons in MeV will be : $[use m_{p} = 1.6 \times 1 0^{- 27} kg, e = 1.6 \times 1 0^{- 19} C$ …2022 · 27 Jul · Shift 2 · Q51 · MCQ
Two long parallel conductors S1 and S2 are separated by a distance 10 cm and carrying currents of 4A and 2A respectively. The conductors are placed along x-axis in X-Y plane. There is a point P located between the conductors (as shown in… Includes diagram2022 · 27 Jun · Shift 2 · Q57 · MCQ
A deuteron and a proton moving with equal kinetic energy enter into a uniform magnetic field at right angle to the field. If rd and rp are the radii of their circular paths respectively, then the ratio $\frac{r _{d}}{r _{p}}$ will be $x$ …2022 · 27 Jun · Shift 2 · Q70 · Numerical
The current sensitivity of a galvanometer can be increased by : (A) decreasing the number of turns (B) increasing the magnetic field (C) decreasing the area of the coil (D) decreasing the torsional constant of the spring Choose the most…2022 · 28 Jul · Shift 1 · Q57 · MCQ
As shown in the figure, a metallic rod of linear density $0.45 kg m^{- 1}$ is lying horizontally on a smooth inclined plane which makes an angle of $4 5^{\circ}$ with the horizontal. The minimum current flowing in the rod… Includes diagram2022 · 28 Jul · Shift 1 · Q58 · MCQ
A triangular shaped wire carrying $10 A$ current is placed in a uniform magnetic field of $0.5 T$ , as shown in figure. The magnetic force on segment $CD$ is (Given $BC = CD = BD = 5 cm$ … Includes diagram2022 · 28 Jul · Shift 2 · Q51 · MCQ
The magnetic field at the center of current carrying circular loop is $B_{1}$ . The magnetic field at a distance of $3$ times radius of the given circular loop from the center on its axis is $B_{2}$ . The value of $B_{1} / B_{2}$ will…2022 · 28 Jul · Shift 2 · Q52 · MCQ
An infinitely long hollow conducting cylinder with radius R carries a uniform current along its surface. Choose the correct representation of magnetic field (B) as a function of radial distance (r) from the axis of cylinder.2022 · 28 Jun · Shift 1 · Q52 · MCQ
A singly ionized magnesium atom (A = 24) ion is accelerated to kinetic energy 5 keV, and is projected perpendicularly into a magnetic field B of the magnitude 0.5 T. The radius of path formed will be cm.2022 · 28 Jun · Shift 1 · Q68 · Numerical
Two parallel, long wires are kept 0.20 m apart in vacuum, each carrying current of x A in the same direction. If the force of attraction per meter of each wire is 2 $\times$ 10 $-$ 6 N, then the value of x is approximately :2022 · 28 Jun · Shift 2 · Q62 · MCQ
A closely wounded circular coil of radius 5 cm produces a magnetic field of $37.68 \times 1 0^{- 4} T$ at its center. The current through the coil is A. [Given, number of turns in the coil is 100 and $π = 3.14$ …2022 · 29 Jul · Shift 1 · Q72 · Numerical
A wire of length $314 cm$ carrying current of $14 A$ is bent to form a circle. The magnetic moment of the coil is A $- m^{2}$ . [Given $π = 3.14$ ]2022 · 29 Jul · Shift 1 · Q74 · Numerical
A wire X of length $50 cm$ carrying a current of $2 A$ is placed parallel to a long wire $Y$ of length $5 m$ . The wire $Y$ carries a current of $3 A$ . The distance between two wires… Includes diagram2022 · 29 Jul · Shift 2 · Q49 · MCQ
A charge particle moves along circular path in a uniform magnetic field in a cyclotron. The kinetic energy of the charge particle increases to 4 times its initial value. What will be the ratio of new radius to the original radius of…2022 · 29 Jun · Shift 1 · Q49 · MCQ
Two long current carrying conductors are placed to each other at a distance of 8 cm between them. The magnitude of magnetic field produced at mid-point between the two conductors due to current flowing in them is 300 $μ$ T. The equal…2022 · 29 Jun · Shift 2 · Q51 · MCQ
Given below are two statements : Statement I : The electric force changes the speed of the charged particle and hence changes its kinetic energy; whereas the magnetic force does not change the kinetic energy of the charged particle.…2022 · 29 Jun · Shift 2 · Q55 · MCQ
A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii r1 and r2 respectively. When a current of strength I is passed through the coil, the magnetic field at its centre will be :2022 · 30 Jun · Shift 1 · Q50 · MCQ
There are two infinitely long straight current carrying conductors and they are held at right angles to each other so that their common ends meet at the origin as shown in the figure given below. The ratio of current in both conductor is 1… Includes diagram2021 · 1 Sep · Shift 2 · Q65 · MCQ
A charge Q is moving $d l$ distance in the magnetic field $B$ . Find the value of work done by $B$ .2021 · 16 Mar · Shift 2 · Q55 · MCQ
A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated windings of the solenoid carry an electric current of 5A. The magnetic flux density produced by the solenoid is : (permeability of free space = 4 $π \times$ …2021 · 17 Mar · Shift 1 · Q52 · MCQ
A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which lies on the centre of the semicircle? Includes diagram2021 · 17 Mar · Shift 2 · Q47 · MCQ
Four identical long solenoids A, B, C and D are connected to each other as shown in the figure. If the magnetic field at the center of A is 3T, the field at the center of C would be : (Assume that the magnetic field is confined with in the… Includes diagram2021 · 18 Mar · Shift 1 · Q51 · MCQ
A loop of flexible wire of irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire.2021 · 18 Mar · Shift 1 · Q60 · MCQ
A proton and an $α$ -particle, having kinetic energies Kp and K $α$ respectively, enter into a magnetic field at right angles. The ratio of the radii of trajectory of proton to that of $α$ -particle is 2 : 1. The ratio of Kp :…2021 · 18 Mar · Shift 2 · Q58 · MCQ
A deuteron and an alpha particle having equal kinetic energy enter perpendicularly into a magnetic field. Let rd and r $α$ be their respective radii of circular path. The value of $\frac{r _{d}}{r _{α}}$ is equal to :2021 · 20 Jul · Shift 1 · Q45 · MCQ
A proton, a deuteron and an $α$ particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them is and their speed is , in the ratio.2021 · 25 Feb · Shift 1 · Q46 · MCQ
Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8 : 1. The radius of coil is .2021 · 25 Feb · Shift 1 · Q50 · MCQ
Two ions having same mass have charges in the ratio 1 : 2. They are projected normally in a uniform magnetic field with their speeds in the ratio 2 : 3. The ratio of the radii of their circular trajectories is :2021 · 25 Jul · Shift 2 · Q51 · MCQ
The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the magnetic field intensity at the centre of the same coil is : (Take r < a)2021 · 26 Aug · Shift 1 · Q43 · MCQ
Two short magnetic dipoles m1 and m2 each having magnetic moment of 1 Am2 are placed at point O and P respectively. The distance between OP is 1 meter. The torque experienced by the magnetic dipole m2 due to the presence of m1 is… Includes diagram2021 · 26 Aug · Shift 1 · Q67 · Numerical
A coil in the shape of an equilateral triangle of side 10 cm lies in a vertical plane between the pole pieces of permanent magnet producing a horizontal magnetic field 20 mT. The torque acting on the coil when a current of 0.2 A is passed…2021 · 26 Aug · Shift 2 · Q69 · Numerical
Two ions of masses 4 amu and 16 amu have charges +2e and +3e respectively. These ions pass through the region of constant perpendicular magnetic field. The kinetic energy of both ions is same. Then :2021 · 27 Aug · Shift 1 · Q53 · MCQ
A uniform conducting wire of length is 24a, and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side 'a' and then in the form of a square of side 'a'. The coil is connected to a voltage source…2021 · 27 Aug · Shift 1 · Q61 · Numerical
A coaxial cable consists of an inner wire of radius 'a' surrounded by an outer shell of inner and outer radii 'b' and 'c' respectively. The inner wire carries an electric current i0, which is distributed uniformly across cross-sectional…2021 · 27 Aug · Shift 2 · Q54 · MCQ
Figure A and B shown to long straight wires of circular cross-section (a and b with a < b), carrying current I which is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r and can be… Includes diagram2021 · 27 Jul · Shift 2 · Q55 · MCQ
A coil having N turns is wound tightly in the form of a spiral with inner and outer radii 'a' and 'b' respectively. Find the magnetic field at centre, when a current I passes through coil:2021 · 31 Aug · Shift 1 · Q50 · MCQ
A current of 1.5 A is flowing through a triangle, of side 9 cm each. The magnetic field at the centroid of the triangle is : (Assume that the current is flowing in the clockwise direction.)2021 · 31 Aug · Shift 2 · Q44 · MCQ
A long solenoid with 1000 turns/m has a core material with relative permeability 500 and volume 103 cm3. If the core material is replaced by another material having relative permeability of 750 with same volume maintaining same current of…2021 · 31 Aug · Shift 2 · Q64 · Numerical
A beam of protons with speed 4 × 105 ms–1 enters a uniform magnetic field of 0.3 T at an angle of 60° to the magnetic field. The pitch of the resulting helical path of protons is close to : (Mass of the proton = 1.67 $\times$ 10–27 kg,…2020 · 2 Sep · Shift 1 · Q59 · MCQ
A wire carrying current I is bent in the shape ABCDEFA as shown, where rectangle ABCDA and ADEFA are perpendicular to each other. If the sides of the rectangles are of lengths a and b, then the magnitude and direction of magnetic moment of… Includes diagram2020 · 2 Sep · Shift 2 · Q51 · MCQ
The figure shows a region of length ‘l’ with a uniform magnetic field of 0.3 T in it and a proton entering the region with velocity 4 $\times$ 105 ms–1 making an angle 60o with the field. If the proton completes 10 revolution by the time… Includes diagram2020 · 2 Sep · Shift 2 · Q53 · MCQ
Magnitude of magnetic field (in SI units) at the centre of a hexagonal shape coil of side 10 cm, 50 turns and carrying current I (Ampere) in units of $\frac{μ _{0} I}{π}$ is :2020 · 3 Sep · Shift 1 · Q49 · MCQ
A charged particle carrying charge 1 $μ$ C is moving with velocity $(2 i + 3 j + 4 k)$ ms–1. If an external magnetic field of $(5 i + 3 j - 6 k)$ × 10–3 T…2020 · 3 Sep · Shift 1 · Q61 · MCQ
A galvanometer coil has 500 turns and each turn has an average area of 3 $\times$ 10–4 m2 . If a torque of 1.5 Nm is required to keep this coil parallel to a magnetic field when a current of 0.5 A is flowing through it, the strength of the…2020 · 3 Sep · Shift 2 · Q42 · Numerical
A wire A, bent in the shape of an arc of a circle, carrying a current of 2 A and having radius 2 cm and another wire B, also bent in the shape of arc of a circle, carrying a current of 3 A and having radius of 4 cm, are placed as shown in… Includes diagram2020 · 4 Sep · Shift 1 · Q52 · MCQ
A circular coil has moment of inertia 0.8 kg m2 around any diameter and is carrying current to produce a magnetic moment of 20 Am2 . The coil is kept initially in a vertical position and it can rotate freely around a horizontal diameter.…2020 · 4 Sep · Shift 2 · Q59 · MCQ
A square loop of side 2 $a$ , and carrying current I, is kept in XZ plane with its centre at origin. A long wire carrying the same current I is placed parallel to the z-axis and passing through the point (0, b, 0), (b >> a). The…2020 · 5 Sep · Shift 1 · Q55 · MCQ
An iron rod of volume 10–3 m3 and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod will be :2020 · 5 Sep · Shift 2 · Q44 · MCQ
A particle of charge q and mass m is moving with a velocity $- v i$ (v $e$ 0) towards a large screen placed in the Y - Z plane at a distance d. If there is a magnetic field $B = B_{0} k$ , the maximum value…2020 · 6 Sep · Shift 1 · Q40 · MCQ
An electron is moving along +x direction with a velocity of 6 $\times$ 106 ms–1. It enters a region of uniform electric field of 300 V/cm pointing along +y direction. The magnitude and direction of the magnetic field set up in this region…2020 · 6 Sep · Shift 1 · Q49 · MCQ
A square loop of side 2 $a$ and carrying current I is kept in xz plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point (0, b, 0), (b >> a). The magnitude of…2020 · 6 Sep · Shift 2 · Q43 · MCQ
A charged particle going around in a circle can be considered to be a current loop. A particle of mass m carrying charge q is moving in a plane with speed v under the influence of magnetic field $B$ . The magnetic moment of…2020 · 6 Sep · Shift 2 · Q44 · MCQ
A particle of mass m and charge q has an initial velocity $v = v_{0} j$ . If an electric field $E = E_{0} i$ and magnetic field $B = B_{0} i$ act on the particle, its…2020 · 7 Jan · Shift 2 · Q56 · MCQ
Photon with kinetic energy of 1MeV moves from south to north. It gets an acceleration of 1012 m/s2 by an applied magnetic field (west to east). The value of magnetic field : (Rest mass of proton is 1.6 × 10–27 kg) :2020 · 8 Jan · Shift 1 · Q62 · MCQ
A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn DMND of radius R. AB, BC parts are tangential to circular turn at N and D. Magnetic… Includes diagram2020 · 8 Jan · Shift 2 · Q45 · MCQ
A charged particle of mass 'm' and charge 'q' moving under the influence of uniform electric field $E i$ and a uniform magnetic field $B k$ follows a trajectory from point P to Q as shown in figure. The… Includes diagram2020 · 9 Jan · Shift 1 · Q52 · MCQ
A long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at distance $\frac{a}{3}$ and 2 $a$ , respectively from the axis of the wire is :2020 · 9 Jan · Shift 1 · Q63 · MCQ
An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed v. If the electron does not… Includes diagram2020 · 9 Jan · Shift 2 · Q54 · MCQ
A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnetic field B perpendicular to its plane such that when rotated slightly about its diameter and released, it starts performing simple…2020 · 9 Jan · Shift 2 · Q60 · MCQ
A thin strip 10 cm long is on a U shaped wire of negligible resistance and it is connected to a spring of spring constant 0.5 Nm–1 (see figure). The assembly is kept in a uniform magnetic field of 0.1 T. If the strip is pulled from its… Includes diagram2019 · 8 Apr · Shift 1 · Q65 · MCQ
A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field B $i \land$ . The torque on the coil due to the magnetic field is :2019 · 8 Apr · Shift 1 · Q69 · MCQ
Two very long, straight, and insulated wires are kept at 90° angle from each other in xy-plane as shown in the figure. These wires carry currents of equal magnitude I, whose directions are shown in the figure. The net magnetic field at… Includes diagram2019 · 8 Apr · Shift 2 · Q49 · MCQ
A rectangular coil (Dimension 5 cm × 2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction is kept centered at the origin and in the X-Z plane. A magnetic field of 1 T is applied along X-axis. If the coil is tilted…2019 · 9 Apr · Shift 1 · Q47 · MCQ
A rigid square loop of side 'a' and carrying current I2 is lying on a horizontal surface near a long current I1 carrying wire in the same plane as shown in figure. The net force on the loop due to wire will be : Includes diagram2019 · 9 Apr · Shift 1 · Q55 · MCQ
A moving coil galvanometer has a coil with 175 turns and area 1 cm2. It uses a torsion band of torsion constant 10–6 N-m/rad. The coil is placed in a maganetic field B parallel to its plane. The coil deflects by 1° for a current of 1 mA.…2019 · 9 Apr · Shift 2 · Q67 · MCQ
An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is d (d > > a). If the loop a applies a force F… Includes diagram2019 · 9 Jan · Shift 1 · Q55 · MCQ
A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field at point O will be close to : Includes diagram2019 · 9 Jan · Shift 1 · Q71 · MCQ
One of the two identical conducting wires of length L is bent in the form of a circular loop and the other one into a circular coil of N identical turns. If the same current is passed in both, the radio of the magnetic field at the central…2019 · 9 Jan · Shift 2 · Q58 · MCQ
A particle having the same charge as of electron moves in a ciurcular path of radius 0.5 cm under the influence of a magnetic field 0f 0.5 T. If an electric field of 100 V/m makes it to move in a straight path, then the mass of the…2019 · 9 Jan · Shift 2 · Q67 · MCQ
A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbits in a plane due to magnetic field perpendicualr to the plane. Let rp, re and rHe be their respective radii, then2019 · 10 Apr · Shift 1 · Q44 · MCQ
Two wires A & B are carrying currents I1 & I2 as shown in the figure. The separation between them is d. A third wire C carrying a current I is to be kept parallel to them at a distance x from A such that the net force acting on it… Includes diagram2019 · 10 Apr · Shift 1 · Q52 · MCQ
The magnitude of the magnetic field at the centre of an equilateral triangular loop of side 1 m which is carrying a current of 10 A is : [Take $μ$ 0 = 4 $π$ × 10–7 NA–2]2019 · 10 Apr · Shift 2 · Q47 · MCQ
A square loop is carrying a steady current I and the magnitude of its magnetic dipole moment is m. if this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular…2019 · 10 Apr · Shift 2 · Q56 · MCQ
An insulating thin rod of length $l$ has a linear charge density $ρ (x)$ = $ρ_{0} \frac{x}{l}$ on it. The rod is rotated about an axis passing through the origin (x = 0) and perpendicular to the rod. If the rod makes n…2019 · 10 Jan · Shift 1 · Q54 · MCQ
A hoop and a solid cylinder of same mass and radius are made of a permanent magnetic material with their magnetic moment parallel to their respective axes. But the magnetic moment of hoop is twice of solid cylinder. They are placed in a…2019 · 10 Jan · Shift 2 · Q62 · MCQ
In an experiment, electrons are accelerated, from rest, by applying a voltage of 500 V. Calculate the radius of the path if a magnetic field 100 mT is then applied. [Charge of the electron = 1.6 $\times$ 10–19 C Mass of the electron = 9.1 $\times$ …2019 · 11 Jan · Shift 1 · Q64 · MCQ
A particle of mass m and charge q is in an electric and magnetic field given by $E = 2 i + 3 j; B = 4 j + 6 k .$ The charged particle is shifted from he origin to the…2019 · 11 Jan · Shift 2 · Q54 · MCQ
The region between y = 0 and y = d contains a magnetic field $B = B z$ . A particle of mass m and charge q enters the region with a velocity $v = v i .$ If d $= \frac{m v}{2 q B},$ the…2019 · 11 Jan · Shift 2 · Q69 · MCQ
A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40 $π$ rad s–1 about its axis, perpendicular to its plane. If the magnetic field at its centre is 3.8 × 10–9 T, then the…2019 · 12 Apr · Shift 1 · Q64 · MCQ
An electron, moving along the x-axis with an initial energy of 100 eV, enters a region of magnetic field $B = (1.5 \times 10^{- 3} T) k$ at S (See figure). The field extends between x = 0 and x… Includes diagram2019 · 12 Apr · Shift 2 · Q42 · MCQ
Find the magnetic field at point P due to a straight line segment AB of length 6 cm carrying a current of 5A. (See figure) ( $μ$ 0 = 4 $π$ × 10–7 N-A–2) Includes diagram2019 · 12 Apr · Shift 2 · Q66 · MCQ
As shown in the figure, two infinitely long, identical wires are bent by 90o and placed in such a way that the segments LP and QM are along the x-axis, while segments PS and QN are parallel to the y-axis. If OP = OQ = 4cm, and the… Includes diagram2019 · 12 Jan · Shift 1 · Q67 · MCQ
A proton and an $α$ -particle (with their masses in the ratio of 1 : 4 and charges in the ratio of 1 : 2) are accelerated from rest through a potential difference V. If a uniform magnetic field (B) is set up perpendicular to their…2019 · 12 Jan · Shift 1 · Q72 · MCQ
A Helmholtz coil has a pair of loops, each with $N$ turns and radius $R$ . They are placed coaxially at distance $R$ and the same current $I$ flows through the loops in the same direction. $P,$ midway between the centers $A$ and $C$ ,… Includes diagram2018 · 15 Apr · Shift 1 · Q58 · MCQ
A current of 1 A is flowing on the sides of an equilateral triangle of side 4.5 $\times$ 10-2 m. The magnetic field at the center of the triangle will be :2018 · 15 Apr · Shift 2 · Q48 · MCQ
A charge q is spread uniformly over an insulated loop of radius r. If it is rotated with an angular velocity $ω$ with resect to normal axis then the magnetic moment of the loop is :2018 · 16 Apr · Shift 1 · Q53 · MCQ
The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is B1. When the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the loop is $B_{2}$ …2018 · Shift 0 · Q49 · MCQ
An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii re, rp, r $_{α}$ respectively in a uniform magnetic field B. The relation between re, rp, r $_{α}$ is:2018 · Shift 0 · Q50 · MCQ
In a certain region static electric and magnetic fields exist. The magnetic field is given by $B = B_{0} (i + 2 j - 4 k)$ . If a test charge moving with a velocity $υ = υ_{0} (3 i - j + 2 k)$ …2017 · 8 Apr · Shift 1 · Q57 · MCQ
A magnetic dipole in a constant magnetic field has :2017 · 8 Apr · Shift 1 · Q58 · MCQ
A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the current. The motion of the charge is :2017 · 9 Apr · Shift 1 · Q59 · MCQ
A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle of 75o. One of the fields has a magnitude of 15 mT. The dipole attains stable equilibrium at an angle of 30o with this field. The magnitude…2016 · 9 Apr · Shift 1 · Q59 · MCQ
To know the resistance G of a galvanometer by half deflection method, a battery of emf VE and resistance R is used to deflect the galvanometer by angle $θ$ . If a shunt of resistance S is needed to get half deflection then G, R and S…2016 · 9 Apr · Shift 1 · Q72 · MCQ
Two identical wires $A$ and $B,$ each of length $^{'} l^{'}$ , carry the same current $I$ . Wire $A$ is bent into a circle of radius $R$ and wire $B$ is bent to form a square of side $^{'} a^{'}$ . If $B_{A}$ and $B_{B}$ are the values of magnetic fields…2016 · Shift 0 · Q47 · MCQ
A rectangular loop of sides $10 c m$ and $5 c m$ carrying a current $1$ of $12 A$ is placed in different orientations as shown in the figures below : If there is a uniform magnetic field of $0.3 T$ in the positive $z$ direction, in which… Includes diagram2015 · Shift 0 · Q51 · MCQ
Two long current carrying thin wires, both with current $I,$ are held by insulating threads of length $L$ and are in equilibrium as shown in the figure, with threads making an angle $^{'} θ^{'}$ with the vertical. If wires have mass $λ$ … Includes diagram2015 · Shift 0 · Q54 · MCQ
A conductor lies along the $z$ -axis at $- 1.5 \leq z < 1.5 m$ and carries a fixed current of $10.0 A$ in $- a_{z}$ direction (see figure). For a field $B = 3.0 \times 1 0^{- 4} e^{- 0.2 x} a_{y} T,$ … Includes diagram2014 · Shift 0 · Q55 · MCQ
A charge $Q$ is uniformly distributed over the surface of non-conducting disc of radius $R .$ The disc rotates about an axis perpendicular to its plane and passing through its center with an angular velocity $ω .$ As a result of this…2012 · Shift 0 · Q53 · MCQ
Proton, deuteron and alpha particle of same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, denuteron and alpha particle are respectively $r_{p}, r_{d}$ and $r_{α}$ . Which one of…2012 · Shift 0 · Q56 · MCQ
A current $I$ flows in an infinitely long wire with cross section in the form of a semi-circular ring of radius $R .$ The magnitude of the magnetic induction along its axis is:2011 · Shift 0 · Q61 · MCQ
Two long parallel wires are at a distance $2 d$ apart. They carry steady equal currents flowing out of the plane of the paper as shown. The variation of the magnetic field $B$ along the line $X X^{'}$ is given by2010 · Shift 0 · Q64 · MCQ
A current loop $A B C D$ is held fixed on the plane of the paper as shown in the figure. The arcs $B C$ (radius $= b$ ) and $D A$ (radius $= a$ ) of the loop are joined by two straight wires $A B$ and $C D$ . A steady current $I$ is flowing in the… Includes diagram2009 · Shift 0 · Q57 · MCQ
A current loop $A B C D$ is held fixed on the plane of the paper as shown in the figure. The arcs $B C$ (radius $= b$ ) and $D A$ (radius $= a$ ) of the loop are joined by two straight wires $A B$ and $C D$ . A steady current $I$ is flowing in the… Includes diagram2009 · Shift 0 · Q58 · MCQ
A horizontal overhead powerline is at height of $4 m$ from the ground and carries a current of $100 A$ from east to west. The magnetic field directly below it on the ground is $(μ_{0} = 4 π \times 10^{- 7} T m A^{- 1})$ …2008 · Shift 0 · Q64 · MCQ
Two identical conducting wires $A O B$ and $C O D$ are placed at right angles to each other. The wire $A O B$ carries an electric current $I_{1}$ and $C O D$ carries a current $I_{2}$ . The magnetic field on a point lying at a distance $d$ from…2007 · Shift 0 · Q72 · MCQ
A charged particle moves through a magnetic field perpendicular to its direction. Then2007 · Shift 0 · Q73 · MCQ