New chat PYQ Library Doubts Rank report

Sign in to see Recents

Sign in to save progress →

Magnetics question

2025 · 2 Apr · Shift 1 · Q56

Guest · try one question or challengeGuest · try one question or challenge

PYQ Library
JEE Main
Physics
Magnetics
2025 · 2 Apr · Shift 1 · Q56

Magnetics question

2025 · 2 Apr · Shift 1 · Q56

JEE MainPhysicsMagneticsMCQ+4 / −1

Let

B_1

be the magnitude of magnetic field at center of a circular coil of radius

R

carrying current I. Let

\mathrm{B}_2

be the magnitude of magnetic field at an axial distance '

x

' from the center. For

x: \mathrm{R}=3: 4, \frac{\mathrm{~B}_2}{\mathrm{~B}_1}

is :

A
$64: 125$
B
$25: 16$
C
$4: 5$
D
$16: 25$

More from Magnetics

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 · 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 · 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 · 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 · 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 · 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 · 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 · 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 · MCQ