Electromagnetic Waves

144 questions · Physics · JEE Main

Electromagnetic Waves

144 questions · Physics · JEE Main

The unit of $\frac{2 I}{ε _{0} c}$ is : (I = intensity of an electromagnetic wave, c = speed of light)2025 · 7 Apr · Shift 2 · Q59 · MCQ
A parallel plate capacitor of area $A = 16 cm^{2}$ and separation between the plates 10 cm , is charged by a DC current. Consider a hypothetical plane surface of area $A_{0} = 3.2 cm^{2}$ inside the capacitor and…2025 · 22 Jan · Shift 2 · Q73 · Numerical
The electric field of an electromagnetic wave in free space is $E = 57 cos [7.5 \times 1 0^{6} t - 5 \times 1 0^{- 3} (3 x + 4 y)] (4 \hat{i} - 3 \hat{j}) N / C$ . The associated magnetic field in Tesla is2025 · 23 Jan · Shift 1 · Q64 · MCQ
A plane electromagnetic wave of frequency 20 MHz travels in free space along the $+ x$ direction. At a particular point in space and time, the electric field vector of the wave is $E_{y} = 9.3 Vm^{- 1}$ . Then, the magnetic…2025 · 23 Jan · Shift 2 · Q52 · MCQ
A time varying potential difference is applied between the plates of a parallel plate capacitor of capacitance $2.5 μ F$ . The dielectric constant of the medium between the capacitor plates is 1 . It produces an instantaneous…2025 · 23 Jan · Shift 2 · Q71 · Numerical
Arrange the following in the ascending order of wavelength $(λ)$ : (A) Microwaves $(λ_{1})$ (B) Ultraviolet rays $(λ_{2})$ (C) Infrared rays $(λ_{3})$ (D) X-rays $(λ_{4})$ …2025 · 24 Jan · Shift 2 · Q64 · MCQ
Due to presence of an em-wave whose electric component is given by $E = 100 sin (ω t - k x) NC^{- 1}$ a cylinder of length 200 cm holds certain amount of em-energy inside it. If another cylinder of same length but half diameter…2025 · 28 Jan · Shift 1 · Q61 · MCQ
The magnetic field of an E.M. wave is given by $B = (\frac{3}{2} \hat{i} + \frac{1}{2} \hat{j}) 30 sin [ω (t - \frac{z}{c})]$ (S.I. Units). The corresponding electric field in S.I.…2025 · 28 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) : Electromagnetic waves carry energy but not momentum. Reason (R) : Mass of a photon is zero. In the light of the above…2025 · 29 Jan · Shift 1 · Q52 · MCQ
A plane electromagnetic wave propagates along the + x direction in free space. The components of the electric field, $E$ and magnetic field, $B$ vectors associated with the wave in Cartesian frame are2025 · 29 Jan · Shift 2 · Q57 · MCQ
If frequency of electromagnetic wave is $60 MHz$ and it travels in air along $z$ direction then the corresponding electric and magnetic field vectors will be mutually perpendicular to each other and the wavelength of the wave (in…2024 · 1 Feb · Shift 2 · Q75 · MCQ
The electric field in an electromagnetic wave is given by $E = \hat{i} 40 cos ω (t - z / c) NC^{- 1}$ . The magnetic field induction of this wave is (in SI unit) :2024 · 4 Apr · Shift 1 · Q75 · MCQ
Arrange the following in the ascending order of wavelength: A. Gamma rays $(λ_{1})$ B. $x$ - rays $(λ_{2})$ C. Infrared waves $(λ_{3})$ D. Microwaves $(λ_{4})$ Choose the…2024 · 4 Apr · Shift 2 · Q79 · MCQ
Match List I with List II : Choose the correct answer from the options given below : Includes table2024 · 5 Apr · Shift 2 · Q64 · MCQ
Electromagnetic waves travel in a medium with speed of $1.5 \times 1 0^{8} m s^{- 1}$ . The relative permeability of the medium is 2.0. The relative permittivity will be:2024 · 6 Apr · Shift 1 · Q64 · MCQ
In the given electromagnetic wave $E_{y} = 600 sin (ω t - kx) Vm^{- 1}$ , intensity of the associated light beam is (in $W / m^{2}$ : (Given $ϵ_{0} = 9 \times 1 0^{- 12} C^{2} N^{- 1} m^{- 2}$ …2024 · 6 Apr · Shift 2 · Q79 · MCQ
Average force exerted on a non-reflecting surface at normal incidence is $2.4 \times 1 0^{- 4} N$ . If $360 W / cm^{2}$ is the light energy flux during span of 1 hour 30 minutes, Then the area of the surface is:2024 · 8 Apr · Shift 1 · Q64 · MCQ
A plane EM wave is propagating along $x$ direction. It has a wavelength of $4 mm$ . If electric field is in $y$ direction with the maximum magnitude of $60 Vm^{- 1}$ , the equation for magnetic field is :2024 · 9 Apr · Shift 1 · Q61 · MCQ
The magnetic field in a plane electromagnetic wave is $B_{y} = (3.5 \times 1 0^{- 7}) sin (1.5 \times 1 0^{3} x + 0.5 \times 1 0^{11} t) T$ . The corresponding electric field will be :2024 · 9 Apr · Shift 2 · Q66 · MCQ
A plane electromagnetic wave propagating in $x$ -direction is described by $E_{y} = (200 Vm^{- 1}) sin [1.5 \times 1 0^{7} t - 0.05 x];$ The intensity of the wave is : (Use $ϵ_{0} = 8.85 \times 1 0^{- 12} C^{2} N^{- 1} m^{- 2}$ …2024 · 27 Jan · Shift 1 · Q76 · MCQ
An object is placed in a medium of refractive index 3 . An electromagnetic wave of intensity $6 \times 1 0^{8} W / m^{2}$ falls normally on the object and it is absorbed completely. The radiation pressure on the object would…2024 · 27 Jan · Shift 2 · Q76 · MCQ
A plane electromagnetic wave of frequency $35 MHz$ travels in free space along the $X$ -direction. At a particular point (in space and time) $E = 9.6 \hat{j} V / m$ . The value of magnetic field at this point…2024 · 29 Jan · Shift 2 · Q72 · MCQ
The electric field of an electromagnetic wave in free space is represented as $E = E_{0} cos (ω t - kz) \hat{i}$ . The corresponding magnetic induction vector will be :2024 · 30 Jan · Shift 1 · Q70 · MCQ
In a plane EM wave, the electric field oscillates sinusoidally at a frequency of $5 \times 1 0^{10} Hz$ and an amplitude of $50 Vm^{- 1}$ . The total average energy density of the electromagnetic field of the wave is :…2024 · 31 Jan · Shift 1 · Q79 · MCQ
Given below are two statements: Statement I: Electromagnetic waves carry energy as they travel through space and this energy is equally shared by the electric and magnetic fields. Statement II: When electromagnetic waves strike a surface,…2024 · 31 Jan · Shift 2 · Q61 · MCQ
Match List I with List II : Choose the correct answer from the options given below : Includes table2023 · 1 Feb · Shift 1 · Q58 · MCQ
The ratio of average electric energy density and total average energy density of electromagnetic wave is :2023 · 1 Feb · Shift 2 · Q49 · MCQ
For the plane electromagnetic wave given by $E = E_{0} sin (ω t - k x)$ and $B = B_{0} sin (ω t - k x)$ , the ratio of average electric energy density to average magnetic energy density is2023 · 6 Apr · Shift 1 · Q57 · MCQ
The energy density associated with electric field $E$ and magnetic field $B$ of an electromagnetic wave in free space is given by $(ϵ_{0} -$ permittivity of free space, $μ_{0} -$ permeability of free space)2023 · 6 Apr · Shift 2 · Q48 · MCQ
The energy of an electromagnetic wave contained in a small volume oscillates with2023 · 10 Apr · Shift 1 · Q50 · MCQ
The amplitude of magnetic field in an electromagnetic wave propagating along y-axis is $6.0 \times 1 0^{- 7} T$ . The maximum value of electric field in the electromagnetic wave is2023 · 10 Apr · Shift 2 · Q48 · MCQ
The electric field in an electromagnetic wave is given as $E = 20 sin ω (t - \frac{x}{c}) j NC^{- 1}$ where $ω$ and $c$ are angular frequency…2023 · 11 Apr · Shift 1 · Q59 · MCQ
A plane electromagnetic wave of frequency $20 MHz$ propagates in free space along $x$ -direction. At a particular space and time, $E = 6.6 \hat{j} V / m$ . What is $B$ …2023 · 11 Apr · Shift 2 · Q44 · MCQ
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$ Assertion A : EM waves used for optical communication have longer wavelengths than that of microwave, employed in…2023 · 12 Apr · Shift 1 · Q47 · MCQ
Which of the following Maxwell's equation is valid for time varying conditions but not valid for static conditions :2023 · 13 Apr · Shift 1 · Q58 · MCQ
In an electromagnetic wave, at an instant and at particular position, the electric field is along the negative $z$ -axis and magnetic field is along the positive $x$ -axis. Then the direction of propagation of electromagnetic wave is:2023 · 13 Apr · Shift 2 · Q51 · MCQ
Match List I with List II of Electromagnetic waves with corresponding wavelength range : Choose the correct answer from the options given below: Includes table2023 · 15 Apr · Shift 1 · Q60 · MCQ
In $E$ and $K$ represent electric field and propagation vectors of the EM waves in vacuum, then magnetic field vector is given by : ( $ω$ - angular frequency) :2023 · 24 Jan · Shift 1 · Q62 · MCQ
The electric field and magnetic field components of an electromagnetic wave going through vacuum is described by $E_{x} = E_{o} sin (kz - ω t) B_{y} = B_{o} sin (kz - ω t)$ Then the correct relation between E…2023 · 24 Jan · Shift 2 · Q54 · MCQ
An electromagnetic wave is transporting energy in the negative $z$ direction. At a certain point and certain time the direction of electric field of the wave is along positive $y$ direction. What will be the direction of the magnetic field…2023 · 25 Jan · Shift 1 · Q59 · MCQ
Match List I with List II Choose the correct answer from the options given below : Includes table2023 · 25 Jan · Shift 2 · Q53 · MCQ
Which of the following are true? A. Speed of light in vacuum is dependent on the direction of propagation. B. Speed of light in a medium is independent of the wavelength of light. C. The speed of light is independent of the motion of the…2023 · 29 Jan · Shift 1 · Q59 · MCQ
Given below are two statements : Statement I : Electromagnetic waves are not deflected by electric and magnetic field. Statement II : The amplitude of electric field and the magnetic field in electromagnetic waves are related to each other…2023 · 29 Jan · Shift 2 · Q52 · MCQ
A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of $24 W$ . The radius of curvature of hemisphere is $10 cm$ and the inner surface is completely…2023 · 30 Jan · Shift 1 · Q67 · Numerical
A point source of $100 W$ emits light with $5%$ efficiency. At a distance of $5 m$ from the source, the intensity produced by the electric field component is:2023 · 30 Jan · Shift 2 · Q54 · MCQ
In a medium the speed of light wave decreases to $0.2$ times to its speed in free space The ratio of relative permittivity to the refractive index of the medium is $x : 1$ . The value of $x$ is . (Given speed of…2023 · 31 Jan · Shift 1 · Q72 · Numerical
Match List I with List II Choose the correct answer from the options given below: Includes table2023 · 31 Jan · Shift 2 · Q50 · MCQ
A plane electromagnetic wave travels in a medium of relative permeability 1.61 and relative permittivity 6.44. If magnitude of magnetic intensity is 4.5 $\times$ 10 $-$ 2 Am $-$ 1 at a point, what will be the approximate magnitude of…2022 · 24 Jun · Shift 1 · Q56 · MCQ
An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.2022 · 24 Jun · Shift 2 · Q61 · MCQ
The rms value of conduction current in a parallel plate capacitor is $6.9 μ A$ . The capacity of this capacitor, if it is connected to $230 V$ ac supply with an angular frequency of $600 rad / s$ ,…2022 · 25 Jul · Shift 1 · Q54 · MCQ
Light wave travelling in air along x-direction is given by $E_{y} = 540 sin π \times 1 0^{4} (x - c t) V m^{- 1}$ . Then, the peak value of magnetic field of wave will be (Given c = 3 $\times$ 108 ms $-$ 1)2022 · 25 Jul · Shift 2 · Q53 · MCQ
The electric field in an electromagnetic wave is given by E = 56.5 sin $ω$ (t $-$ x/c) NC $-$ 1. Find the intensity of the wave if it is propagating along x-axis in the free space. (Given : $ε$ 0 = 8.85 $\times$ 10 $-$ 12C2N $-$ …2022 · 25 Jun · Shift 1 · Q55 · MCQ
The electromagnetic waves travel in a medium at a speed of 2.0 $\times$ 108 m/s. The relative permeability of the medium is 1.0. The relative permittivity of the medium will be :2022 · 25 Jun · Shift 2 · Q58 · MCQ
The magnetic field of a plane electromagnetic wave is given by : $B = 2 \times 1 0^{- 8} sin (0.5 \times 1 0^{3} x + 1.5 \times 1 0^{11} t) \hat{j} T$ . The amplitude of the electric…2022 · 26 Jul · Shift 1 · Q49 · MCQ
The oscillating magnetic field in a plane electromagnetic wave is given by $B_{y} = 5 \times 1 0^{- 6} sin 1000 π (5 x - 4 \times 1 0^{8} t) T$ . The amplitude of electric field will be :2022 · 26 Jul · Shift 2 · Q45 · MCQ
A velocity selector consists of electric field $E = E \hat{k}$ and magnetic field $B = B \hat{j}$ with $B = 12 m T$ . The value of $E$ required for an electron of energy $728 e V$ moving along the positive $x$ -axis to…2022 · 26 Jul · Shift 2 · Q55 · MCQ
If Electric field intensity of a uniform plane electromagnetic wave is given as $E = - 301.6 sin (k z - ω t) a_{x} + 452.4 sin (k z - ω t) a_{y} \frac{V}{m}$ . Then magnetic intensity 'H' of this wave in Am $-$ 1…2022 · 26 Jun · Shift 1 · Q55 · MCQ
In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size $\frac{λ}{100}$ , where $λ$ is the wavelength of the wave in free space. The phenomenon, which happens there will be :2022 · 26 Jun · Shift 1 · Q56 · MCQ
Which is the correct ascending order of wavelengths?2022 · 26 Jun · Shift 2 · Q61 · MCQ
A beam of light travelling along $X$ -axis is described by the electric field $E_{y} = 900 sin ω (t - x / c)$ . The ratio of electric force to magnetic force on a charge $q$ moving along $Y$ -axis with a speed of $3 \times 1 0^{7} ms^{- 1}$ …2022 · 27 Jul · Shift 1 · Q59 · MCQ
Identify the correct statements from the following descriptions of various properties of electromagnetic waves. (A) In a plane electromagnetic wave electric field and magnetic field must be perpendicular to each other and direction of…2022 · 27 Jul · Shift 2 · Q53 · MCQ
Match List-I with List-II : Choose the correct answer from the options given below : Includes table2022 · 27 Jun · Shift 1 · Q53 · MCQ
Given below are two statements : Statement I : A time varying electric field is a source of changing magnetic field and vice-versa. Thus a disturbance in electric or magnetic field creates EM waves. Statement II : In a material medium, the…2022 · 27 Jun · Shift 2 · Q59 · MCQ
Sun light falls normally on a surface of area $36 cm^{2}$ and exerts an average force of $7.2 \times 1 0^{- 9} N$ within a time period of 20 minutes. Considering a case of complete absorption, the energy flux of incident…2022 · 28 Jul · Shift 2 · Q54 · MCQ
A radar sends an electromagnetic signal of electric field (E0) = 2.25 V/m and magnetic field (B0) = 1.5 $\times$ 10 $-$ 8 T which strikes a target on line of sight at a distance of 3 km in a medium. After that, a part of signal (echo)…2022 · 28 Jun · Shift 1 · Q53 · MCQ
An EM wave propagating in x-direction has a wavelength of 8 mm. The electric field vibrating y-direction has maximum magnitude of 60 Vm $-$ 1. Choose the correct equations for electric and magnetic fields if the EM wave is propagating in…2022 · 28 Jun · Shift 2 · Q64 · MCQ
Match List - I with List - II : Choose the correct answer from the options given below : Includes table2022 · 29 Jul · Shift 1 · Q62 · MCQ
Nearly 10% of the power of a $110 W$ light bulb is converted to visible radiation. The change in average intensities of visible radiation, at a distance of $1 m$ from the bulb to a distance of $5 m$ is $a \times 1 0^{- 2} W / m^{2}$ …2022 · 29 Jul · Shift 2 · Q63 · Numerical
The intensity of the light from a bulb incident on a surface is 0.22 W/m2. The amplitude of the magnetic field in this light-wave is $\times$ 10 $-$ 9 T. (Given : Permittivity of vacuum $\in$ 0 = 8.85 $\times$ 10…2022 · 29 Jun · Shift 1 · Q60 · Numerical
The displacement current of 4.425 $μ$ A is developed in the space between the plates of parallel plate capacitor when voltage is changing at a rate of 106 Vs $-$ 1. The area of each plate of the capacitor is 40 cm2. The distance between…2022 · 29 Jun · Shift 2 · Q67 · Numerical
An expression for oscillating electric field in a plane electromagnetic wave is given as Ez = 300 sin(5 $π \times$ 103x $-$ 3 $π \times$ 1011t) Vm $-$ 1 Then, the value of magnetic field amplitude will be : (Given : speed of light in…2022 · 30 Jun · Shift 1 · Q54 · MCQ
Electric field of plane electromagnetic wave propagating through a non-magnetic medium is given by E = 20cos(2 $\times$ 1010 t $-$ 200x) V/m. The dielectric constant of the medium is equal to : (Take $μ$ r = 1)2021 · 1 Sep · Shift 2 · Q64 · MCQ
A plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along y-direction. At a particular point in space and time, $B$ = 8.0 $\times$ 10 $-$ 8 $z$ T. The value of electric field at this point is :…2021 · 16 Mar · Shift 1 · Q53 · MCQ
For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue) and magnetic (Um) fields is :2021 · 16 Mar · Shift 1 · Q56 · MCQ
If 2.5 $\times$ 10 $-$ 6 N average force is exerted by a light wave on a non-reflecting surface of 30 cm2 area during 40 minutes of time span, the energy flux of light just before it falls on the surface is …2021 · 17 Mar · Shift 1 · Q70 · Numerical
The electric field intensity produced by the radiation coming from a 100 W bulb at a distance of 3 m is E. The electric field intensity produced by the radiation coming from 60W at the same distance is $\frac{x}{5}$ E. Where the…2021 · 17 Mar · Shift 2 · Q64 · Numerical
Seawater at a frequency f = 9 $\times$ 102 Hz, has permittivity $ε$ = 80 $ε$ 0 and resistivity $ρ$ = 0.25 $Ω$ m. Imagine a parallel plate capacitor is immersed in seawater and is driven by an alternating voltage…2021 · 17 Mar · Shift 2 · Q70 · Numerical
A plane electromagnetic wave of frequency 100 MHz is travelling in vacuum along the x-direction. At a particular point in space and time, $B = 2.0 \times 1 0^{- 8} k T$ . (where, $k$ is unit vector along…2021 · 18 Mar · Shift 1 · Q49 · MCQ
A plane electromagnetic wave propagating along y-direction can have the following pair of electric field $(E)$ and magnetic field $(B)$ components.2021 · 18 Mar · Shift 2 · Q44 · MCQ
In an electromagnetic wave the electric field vector and magnetic field vector are given as $E = E_{0} i$ and $B = B_{0} k$ respectively. The direction of propagation of electromagnetic wave…2021 · 20 Jul · Shift 2 · Q51 · MCQ
Intensity of sunlight is observed as 0.092 Wm $-$ 2 at a point in free space. What will be the peak value of magnetic field at the point? ( $ε_{0} = 8.85 \times 1 0^{- 12} C^{2} N^{- 1} m^{- 2}$ )2021 · 22 Jul · Shift 2 · Q52 · MCQ
An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are 2. Its velocity in this medium is $\times$ 107 m/s.2021 · 24 Feb · Shift 1 · Q65 · Numerical
Match List - I with List - II. Choose the correct answer from the options given below : Includes table2021 · 24 Feb · Shift 2 · Q56 · MCQ
An electromagnetic wave of frequency 3 GHz enters a dielectric medium of relative electric permittivity 2.25 from vacuum. The wavelength of this wave in that medium will be $\times$ 10 $-$ 2 cm.2021 · 24 Feb · Shift 2 · Q62 · Numerical
The peak electric field produced by the radiation coming from the 8W bulb at a distance of 10 m is $\frac{x}{10} \frac{μ _{0} c}{π} \frac{V}{m}$ . The efficiency of the bulb is 10% and it is a point source. The value of x…2021 · 25 Feb · Shift 2 · Q71 · Numerical
The wavelength of an X-ray beam is 10 $A o$ . The mass of a fictitious particle having the same energy as that of the X-ray photons is $\frac{x}{3} h$ kg. The value of x is . (h = Planck's constant)2021 · 25 Feb · Shift 2 · Q73 · Numerical
A linearly polarized electromagnetic wave in vacuum is $E = 3.1 cos [(1.8) z - (5.4 \times 10^{6}) t] i N / C$ is incident normally on a perfectly reflecting wall at z = a. Choose the correct option2021 · 25 Jul · Shift 1 · Q59 · MCQ
The electric field in a plane electromagnetic wave is given by $E = 200 cos [(\frac{0.5 \times 10 ^{3}}{m}) x - (1.5 \times 10^{11} \frac{r a d}{s} \times t)] \frac{V}{m} j$ …2021 · 26 Aug · Shift 1 · Q64 · Numerical
A light beam is described by $E = 800 sin ω (t - \frac{x}{c})$ . An electron is allowed to move normal to the propagation of light beam with a speed of 3 $\times$ 107 ms $-$ 1. What is the maximum magnetic force…2021 · 26 Aug · Shift 2 · Q51 · MCQ
A radiation is emitted by 1000W bulb and it generates an electric field and magnetic field at P, placed at a distance of 2m. The efficiency of the bulb is 1.25%. The value of peak electric field at P is x $\times$ 10 $-$ 1 V/m. Value of x…2021 · 26 Feb · Shift 1 · Q70 · Numerical
Electric field in a plane electromagnetic wave is given by E = 50 sin(500x $-$ 10 $\times$ 1010 t) V/m The velocity of electromagnetic wave in this medium is : (Given C = speed of light in vacuum)2021 · 27 Aug · Shift 1 · Q56 · MCQ
A plane electromagnetic wave with frequency of 30 MHz travels in free space. At particular point in space and time, electric field is 6 V/m. The magnetic field at this point will be x $\times$ 10 $-$ 8 T. The value of x is …2021 · 27 Aug · Shift 2 · Q66 · Numerical
The relative permittivity of distilled water is 81. The velocity of light in it will be : (Given $μ$ r = 1)2021 · 27 Jul · Shift 1 · Q50 · MCQ
The electric field in an electromagnetic wave is given by E = (50 NC $-$ 1) sin $ω$ (t $-$ x/c) The energy contained in a cylinder of volume V is 5.5 $\times$ 10 $-$ 12 J. The value of V is cm3. (given $\in$ …2021 · 31 Aug · Shift 1 · Q70 · Numerical
The magnetic field vector of an electromagnetic wave is given by $B = B_{0} \frac{i + j}{2} cos (k z - ω t)$ ; where $i, j$ represents unit vector along x and y-axis respectively. At t =…2021 · 31 Aug · Shift 2 · Q54 · MCQ
A plane electromagnetic wave, has frequency of 2.0 $\times$ 1010 Hz and its energy density is 1.02 $\times$ 10–8 J/m3 in vacuum. The amplitude of the magnetic field of the wave is close to ( $\frac{1}{4 π ε _{0}} = 9 \times 1 0^{9} \frac{N m ^{2}}{C ^{2}}$ …2020 · 2 Sep · Shift 1 · Q55 · MCQ
In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by $k$ and $2 i - 2 j$ , respectively. What is the unit vector along direction of propagation of the wave?2020 · 2 Sep · Shift 2 · Q62 · MCQ
The magnetic field of a plane electromagnetic wave is $B = 3 \times 1 0^{- 8} sin [200 π (y + c t)] i$ T where c = 3 $\times$ 108 ms–1 is the speed of light. The corresponding…2020 · 3 Sep · Shift 1 · Q62 · MCQ
The electric field of a plane electromagnetic wave propagating along the x direction in vacuum is $E = E_{0} j cos (ω t - k x)$ . The magnetic field $B$ , at the moment t = 0 is :2020 · 3 Sep · Shift 2 · Q48 · MCQ
Choose the correct option relating wave lengths of different parts of electromagnetic wave spectrum:2020 · 4 Sep · Shift 1 · Q46 · MCQ
The electric field of a plane electromagnetic wave is given by $E = E_{0} (x + y) sin (k z - ω t)$ Its magnetic field will be given by :2020 · 4 Sep · Shift 2 · Q54 · MCQ
An electron is constrained to move along the y-axis with a speed of 0.1 c (c is the speed of light) in the presence of electromagnetic wave, whose electric field is $E = 30 j sin (1.5 \times 10^{7} t - 5 \times 10^{- 2} x)$ …2020 · 5 Sep · Shift 1 · Q50 · MCQ
The correct match between the entries in column I and column II are : Includes table2020 · 5 Sep · Shift 2 · Q49 · MCQ
Suppose that intensity of a laser is $\frac{315}{π}$ W/m2. The rms electric field, in units of V/m associated with this source is close to the nearest integer is . $\in$ 0 = 8.86 × 10–12 C2 Nm–2; c = 3 × 108…2020 · 6 Sep · Shift 1 · Q61 · Numerical
For a plane electromagnetic wave, the magnetic field at a point x and time t is $B (x, t)$ = $[1.2 \times 10^{- 7} sin (0.5 \times 10^{3} x + 1.5 \times 10^{11} t) k]$ …2020 · 6 Sep · Shift 2 · Q52 · MCQ
If the magnetic field in a plane electromagnetic wave is given by $B$ = 3 $\times$ 10-8 sin(1.6 $\times$ 103x + 48 $\times$ 1010t) $j$ T, then what will be expression for electric field ?2020 · 7 Jan · Shift 1 · Q48 · MCQ
The electric field of a plane electromagnetic wave is given by $E = E_{0} \frac{i + j}{2} cos (k z + ω t)$ At t = 0, a positively charged particle is at the point (x, y, z) = $(0, 0, \frac{π}{k})$ …2020 · 7 Jan · Shift 2 · Q46 · MCQ
A plane electromagnetic wave of frequency 25 GHz is propagating in vacuum along the z-direction. At a particular point in space and time, the magnetic field is given by $B = 5 \times 1 0^{- 8} j T$ . The…2020 · 8 Jan · Shift 2 · Q53 · MCQ
The electric fields of two plane electromagnetic plane waves in vacuum are given by $E_{1} = E_{0} j cos (ω t - k x)$ and $E_{2} = E_{0} k cos (ω t - k y)$ …2020 · 9 Jan · Shift 1 · Q62 · MCQ
A plane electromagnetic wave is propagating along the direction $\frac{i + j}{2}$ , with its polarization along the direction $k$ . The correct form of the magnetic field of the wave would be (here B0…2020 · 9 Jan · Shift 2 · Q62 · MCQ
A plane electromagnetic wave travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time is E = 6 V m–1 along y-direction. Its corresponding magnetic field component, B…2019 · 8 Apr · Shift 1 · Q54 · MCQ
The magnetic field of an electromagnetic wave is given by :- $B \to = 1.6 \times 1 0^{- 6} cos (2 \times 10^{7} z + 6 \times 10^{15} t) (2 i \land + j \land) \frac{W b}{m ^{2}}$ …2019 · 8 Apr · Shift 2 · Q51 · MCQ
The magnetic field of a plane electromagnetic wave is given by : $\overline{B} = B_{0} i [cos (k z - ω t)] + B_{i} j cos (k z + ω t)$ B0 = 3 × 10–5 T and B1 = 2 × 10–6 T. The rms value of the force…2019 · 9 Apr · Shift 1 · Q50 · MCQ
50 W/m2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m2 surface area will be close to (c =…2019 · 9 Apr · Shift 2 · Q56 · MCQ
A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in space and time, $E = 6.3 j V / m .$ The corresponding magnetic field $B,$ …2019 · 9 Jan · Shift 1 · Q51 · MCQ
The energy associated with electric field is (UE) and with magnetic field is (UB) for an electromagnetic wave in free space. Then :2019 · 9 Jan · Shift 2 · Q69 · MCQ
The electric field of a plane electromagnetic wave is given by $E = E_{0} i cos (k z) cos (ω t)$ The corresponding magnetic field $B$ is then given by2019 · 10 Apr · Shift 1 · Q54 · MCQ
Light is incident normally on a completely absorbing surface with an energy flux of 25 W cm–2. If the surface has an area of 25 cm2, the momentum transferred to the surface in 40 min time duration will be :2019 · 10 Apr · Shift 2 · Q49 · MCQ
If the magnetic field of a plane electromagnetic wave is given by (the speed of light = 3 × 108 B = 100 × 10–6 sin $[2 π \times 2 \times 10^{15} (t - \frac{x}{c})]$ then the maximum electric field…2019 · 10 Jan · Shift 1 · Q48 · MCQ
The electric field of a plane polarized electromagnetic wave in free space at time t = 0 is given by an expression $E (x, y) = 10 j cos [(6 x + 8 z)] .$ The magnetic field $B$ …2019 · 10 Jan · Shift 2 · Q65 · MCQ
An electromagnetic wave of intensity 50 Wm–2 enters in a medium of refractive index 'n' without any loss. The ratio of the magnitudes of electric, and the ratio of the magnitudes of magnetic fields of the wave before and after entering…2019 · 11 Jan · Shift 1 · Q42 · MCQ
A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by : [Given permittivity of space $\in$ 0 = 9 $\times$ 10–12 SI units, Speed of light c = 3 $\times$ …2019 · 11 Jan · Shift 2 · Q58 · MCQ
An electromagnetic wave is represented by the electric field $E = E_{0} n sin [ω t + (6 y - 8 z)]$ . Taking unit vectors in x, y and z directions to be $i, j, k$ …2019 · 12 Apr · Shift 1 · Q49 · MCQ
A plane electromagnetic wave having a frequency v = 23.9 GHz propagates along the positive z-direction in free space. The peak value of the Electric Field is 60 V/m. Which among the following is the acceptable magnetic field component in…2019 · 12 Apr · Shift 2 · Q41 · MCQ
A light wave is incident normally on a glass slab of refractive index 1.5. If 4 % of light gets reflected and the amplitude of the electric field of the incident light is 30 V/m, then the amplitude of the electric field for the wave…2019 · 12 Jan · Shift 1 · Q62 · MCQ
The mean intensity of radiation on the surface of the Sun is about 108 W/m2 . The rms value of the corresponding magnetic field is closet to :2019 · 12 Jan · Shift 2 · Q49 · MCQ
A monochromatic beam of light has a frequency $v = \frac{3}{2 π} \times 1 0^{12} H z$ and is propagating along the direction $\frac{i + j}{2} .$ It is polarized along the $k$ direction. The…2018 · 15 Apr · Shift 1 · Q48 · MCQ
A plane polarized monochromatic EM wave is traveling in vacuum along z direction such that at t = t1 it is found that the electric field is zero at a spatial point z1. The next zero that occurs in its neighbourhood is at z2. The frequency…2018 · 15 Apr · Shift 2 · Q46 · MCQ
A plane electromagnetic wave of wavelength $λ$ has an intensity I. It is propagatting along the positive Y-direction. The allowed expressions for the electric and magnetic fields are givn by :2018 · 16 Apr · Shift 1 · Q55 · MCQ
An EM wave from air enters a medium. The electric fields are $E_{1}$ = $E_{01} x cos [2 π v (\frac{z}{c} - t)]$ in air and $E_{2}$ = $E_{02} x cos [k (2 z - c t)]$ …2018 · Shift 0 · Q47 · MCQ
Magnetic field in a plane electromagnetic wave is given by $B$ = B0 sin (k x + $ω$ t) $j T$ Expression for corresponding electric field will be : Where c is speed of light.2017 · 8 Apr · Shift 1 · Q52 · MCQ
The electric field component of a monochromatic radiation is given by $E$ = 2 E0 $i$ cos kz cos $ω$ t Its magnetic field $B$ is then given by :2017 · 9 Apr · Shift 1 · Q57 · MCQ
Microwave oven acts on the principle of :2016 · 9 Apr · Shift 1 · Q47 · MCQ
Consider an electromagnetic wave propagating in vacuum. Choose the correct statement :2016 · 10 Apr · Shift 1 · Q43 · MCQ
Arrange the following electromagnetic radiations per quantum in the order of increasing energy : A : Blue light B : Yellow light C : X-ray D : Radiowave.2016 · Shift 0 · Q42 · MCQ
Match List - $1$ (Electromagnetic wave type ) with List - $2$ (Its association/application) and select the correct option from the choices given below the lists: Includes diagram2014 · Shift 0 · Q47 · MCQ
During the propagation of electromagnetic waves in a medium :2014 · Shift 0 · Q49 · MCQ
The magnetic field in a travelling electromagnetic wave has a peak value of $20 n T$ . The peak value of electric field strength is :2013 · Shift 0 · Q52 · MCQ
An electromagnetic wave in vacuum has the electric and magnetic field $E \to$ and $B \to$ , which are always perpendicular to each other. The direction of polarization is given by $X \to$ and…2012 · Shift 0 · Q50 · MCQ
The $r m s$ value of the electric field of the light coming from the Sun is $720 N / C .$ The average total energy density of the electromagnetic wave is2006 · Shift 0 · Q83 · MCQ
An electromagnetic wave of frequency $v = 3.0 M H z$ passes from vacuum into a dielectric medium with permittivity $\in= 4.0.$ Then2004 · Shift 0 · Q118 · MCQ
A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is2004 · Shift 0 · Q121 · MCQ
Which of the following are not electromagnetic waves?2002 · Shift 0 · Q116 · MCQ
Electromagnetic waves are transverse in nature is evident by2002 · Shift 0 · Q130 · MCQ