# Electromagnetic Waves · Physics · JEE Main

Start Practice## MCQ (Single Correct Answer)

JEE Main 2014 (Online) 9th April Morning Slot

Match List I (Wavelength range of electromagnetic spectrum) with List II. (Method of production of these waves) and select the correct option from th...

JEE Main 2014 (Online) 11th April Morning Slot

An electromagnetic wave of frequency 1 $$ \times $$ 1014 hertz is propagating along z - axis. The amplitude of electric field is 4 V/m. If $$ \in $$0...

JEE Main 2014 (Online) 11th April Morning Slot

Match the List - I (Phenomenon associated with electromagnetic radiation) with List - II (Part of electromagnetic spectrum) and select the correct cod...

JEE Main 2014 (Online) 12th April Morning Slot

A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves a...

JEE Main 2014 (Online) 19th April Morning Slot

If microwaves, X rays, infracted, gamma rays, ultra-violet, radio waves and visible parts of the electromagnetic spectrum by M, X, I, G, U, R and V, ...

JEE Main 2015 (Online) 10th April Morning Slot

An electromagnetic wave travelling in the x-direction has frequency of 23 $$ \times $$ 1014 Hz and electric field amplitude of 27 Vm$$-$$1. From the o...

JEE Main 2015 (Online) 11th April Morning Slot

For plane electromagnetic waves propagating in the z direction, which one of the following combination gives the correct possible direction for $$\...

JEE Main 2024 (Online) 9th April Evening Shift

The magnetic field in a plane electromagnetic wave is $$\mathrm{B}_{\mathrm{y}}=\left(3.5 \times 10^{-7}\right) \sin \left(1.5 \times 10^3 x+0.5 \time...

JEE Main 2024 (Online) 9th April Morning Shift

A plane EM wave is propagating along $$x$$ direction. It has a wavelength of $$4 \mathrm{~mm}$$. If electric field is in $$y$$ direction with the maxi...

JEE Main 2024 (Online) 8th April Morning Shift

Average force exerted on a non-reflecting surface at normal incidence is $$2.4 \times 10^{-4} \mathrm{~N}$$. If $$360 \mathrm{~W} / \mathrm{cm}^2$$ is...

JEE Main 2024 (Online) 6th April Evening Shift

In the given electromagnetic wave $$\mathrm{E}_{\mathrm{y}}=600 \sin (\omega t-\mathrm{kx}) \mathrm{Vm}^{-1}$$, intensity of the associated light beam...

JEE Main 2024 (Online) 6th April Morning Shift

Electromagnetic waves travel in a medium with speed of $$1.5 \times 10^8 \mathrm{~m} \mathrm{~s}^{-1}$$. The relative permeability of the medium is 2....

JEE Main 2024 (Online) 5th April Evening Shift

Match List I with List II :
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JEE Main 2024 (Online) 4th April Evening Shift

Arrange the following in the ascending order of wavelength:
A. Gamma rays $$\left(\lambda_1\right)$$
B. $$x$$ - rays $$\left(\lambda_2\right)$$
C. Inf...

JEE Main 2024 (Online) 4th April Morning Shift

The electric field in an electromagnetic wave is given by $$\overrightarrow{\mathrm{E}}=\hat{i} 40 \cos \omega(\mathrm{t}-z / \mathrm{c}) \mathrm{NC}^...

JEE Main 2024 (Online) 1st February Evening Shift

If frequency of electromagnetic wave is $60 \mathrm{~MHz}$ and it travels in air along $z$ direction then the corresponding electric and magnetic fiel...

JEE Main 2024 (Online) 31st January Evening Shift

Given below are two statements:
Statement I: Electromagnetic waves carry energy as they travel through space and this energy is equally shared by the ...

JEE Main 2024 (Online) 31st January Morning Shift

In a plane EM wave, the electric field oscillates sinusoidally at a frequency of $$5 \times 10^{10} \mathrm{~Hz}$$ and an amplitude of $$50 \mathrm{~V...

JEE Main 2024 (Online) 30th January Morning Shift

The electric field of an electromagnetic wave in free space is represented as $$\overrightarrow{\mathrm{E}}=\mathrm{E}_0 \cos (\omega \mathrm{t}-\math...

JEE Main 2024 (Online) 29th January Evening Shift

A plane electromagnetic wave of frequency $$35 \mathrm{~MHz}$$ travels in free space along the $$X$$-direction. At a particular point (in space and ti...

JEE Main 2024 (Online) 27th January Evening Shift

An object is placed in a medium of refractive index 3 . An electromagnetic wave of intensity $$6 \times 10^8 \mathrm{~W} / \mathrm{m}^2$$ falls normal...

JEE Main 2024 (Online) 27th January Morning Shift

A plane electromagnetic wave propagating in $$\mathrm{x}$$-direction is described by
$$E_y=\left(200 \mathrm{Vm}^{-1}\right) \sin \left[1.5 \times 10^...

JEE Main 2023 (Online) 15th April Morning Shift

Match List I with List II of Electromagnetic waves with corresponding wavelength range :
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...

JEE Main 2023 (Online) 13th April Evening Shift

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 ...

JEE Main 2023 (Online) 13th April Morning Shift

Which of the following Maxwell's equation is valid for time varying conditions but not valid for static conditions :

JEE Main 2023 (Online) 12th April Morning Shift

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$
Assertion A : EM waves ...

JEE Main 2023 (Online) 11th April Evening Shift

A plane electromagnetic wave of frequency $$20 ~\mathrm{MHz}$$ propagates in free space along $$\mathrm{x}$$-direction. At a particular space and time...

JEE Main 2023 (Online) 11th April Morning Shift

The electric field in an electromagnetic wave is given as
$$\overrightarrow{\mathrm{E}}=20 \sin \omega\left(\mathrm{t}-\frac{x}{\mathrm{c}}\right) \ov...

JEE Main 2023 (Online) 10th April Evening Shift

The amplitude of magnetic field in an electromagnetic wave propagating along y-axis is $$6.0 \times 10^{-7} \mathrm{~T}$$. The maximum value of electr...

JEE Main 2023 (Online) 10th April Morning Shift

The energy of an electromagnetic wave contained in a small volume oscillates with

JEE Main 2023 (Online) 6th April Evening Shift

The energy density associated with electric field $$\vec{E}$$ and magnetic field $$\vec{B}$$ of an electromagnetic wave in free space is given by $$\l...

JEE Main 2023 (Online) 6th April Morning Shift

For the plane electromagnetic wave given by $$E=E_{0} \sin (\omega t-k x)$$ and $$B=B_{0} \sin (\omega t-k x)$$, the ratio of average electric energy ...

JEE Main 2023 (Online) 1st February Evening Shift

The ratio of average electric energy density and total average energy density of electromagnetic wave is :

JEE Main 2023 (Online) 1st February Morning Shift

Match List I with List II :
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JEE Main 2023 (Online) 31st January Evening Shift

Match List I with List II
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JEE Main 2023 (Online) 30th January Evening Shift

A point source of $100 \mathrm{~W}$ emits light with $5 \%$ efficiency. At a distance of $5 \mathrm{~m}$ from the source, the intensity produced by th...

JEE Main 2023 (Online) 29th January Evening Shift

Given below are two statements :
Statement I : Electromagnetic waves are not deflected by electric and magnetic field.
Statement II : The amplitude of...

JEE Main 2023 (Online) 29th January Morning Shift

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 independen...

JEE Main 2023 (Online) 25th January Evening Shift

Match List I with List II
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JEE Main 2023 (Online) 25th January Morning Shift

An electromagnetic wave is transporting energy in the negative $$z$$ direction. At a certain point and certain time the direction of electric field of...

JEE Main 2023 (Online) 24th January Evening Shift

The electric field and magnetic field components of an electromagnetic wave going through vacuum is described by
$$\mathrm{{E_x} = {E_o}\sin (kz - \om...

JEE Main 2023 (Online) 24th January Morning Shift

In $$\overrightarrow E $$ and $$\overrightarrow K $$ represent electric field and propagation vectors of the EM waves in vacuum, then magnetic field v...

JEE Main 2022 (Online) 29th July Morning Shift

Match List - I with List - II :
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JEE Main 2022 (Online) 28th July Evening Shift

Sun light falls normally on a surface of area $$36 \mathrm{~cm}^{2}$$ and exerts an average force of $$7.2 \times 10^{-9} \mathrm{~N}$$ within a time ...

JEE Main 2022 (Online) 27th July Evening Shift

Identify the correct statements from the following descriptions of various properties of electromagnetic waves.
(A) In a plane electromagnetic wave el...

JEE Main 2022 (Online) 27th July Morning Shift

A beam of light travelling along $$X$$-axis is described by the electric field $$E_{y}=900 \sin \omega(\mathrm{t}-x / c)$$. The ratio of electric forc...

JEE Main 2022 (Online) 26th July Evening Shift

The oscillating magnetic field in a plane electromagnetic wave is given by $$B_{y}=5 \times 10^{-6} \sin 1000 \pi\left(5 x-4 \times 10^{8} t\right) T$...

JEE Main 2022 (Online) 26th July Evening Shift

A velocity selector consists of electric field $$\vec{E}=E \,\hat{k}$$ and magnetic field $$\vec{B}=B \,\hat{j}$$ with $$B=12 \,m T$$. The value of $$...

JEE Main 2022 (Online) 26th July Morning Shift

The magnetic field of a plane electromagnetic wave is given by :
$$
\overrightarrow{\mathrm{B}}=2 \times 10^{-8} \sin \left(0.5 \times 10^{3} x+1.5 \t...

JEE Main 2022 (Online) 25th July Evening Shift

Light wave travelling in air along x-direction is given by $${E_y} = 540\sin \pi \times {10^4}(x - ct)\,V{m^{ - 1}}$$. Then, the peak value of magnet...

JEE Main 2022 (Online) 25th July Morning Shift

The rms value of conduction current in a parallel plate capacitor is $$6.9 \,\mu \mathrm{A}$$. The capacity of this capacitor, if it is connected to $...

JEE Main 2022 (Online) 30th June Morning Shift

An expression for oscillating electric field in a plane electromagnetic wave is given as Ez = 300 sin(5$$\pi$$ $$\times$$ 103x $$-$$ 3$$\pi$$ $$\times...

JEE Main 2022 (Online) 28th June Evening Shift

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 ...

JEE Main 2022 (Online) 28th June Morning Shift

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 o...

JEE Main 2022 (Online) 27th June Evening Shift

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...

JEE Main 2022 (Online) 27th June Morning Shift

Match List-I with List-II :
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JEE Main 2022 (Online) 26th June Evening Shift

Which is the correct ascending order of wavelengths?

JEE Main 2022 (Online) 26th June Morning Shift

If Electric field intensity of a uniform plane electromagnetic wave is given as $$E = - 301.6\sin (kz - \omega t){\widehat a_x} + 452.4\sin (kz - \om...

JEE Main 2022 (Online) 26th June Morning Shift

In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size $${\lambda \over {100}}$$, where $$\lambda$$ is ...

JEE Main 2022 (Online) 25th June Evening Shift

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 permit...

JEE Main 2022 (Online) 25th June Morning Shift

The electric field in an electromagnetic wave is given by E = 56.5 sin $$\omega$$(t $$-$$ x/c) NC$$-$$1. Find the intensity of the wave if it is propa...

JEE Main 2022 (Online) 24th June Evening Shift

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 th...

JEE Main 2022 (Online) 24th June Morning Shift

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...

JEE Main 2021 (Online) 1st September Evening Shift

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 ...

JEE Main 2021 (Online) 31st August Evening Shift

The magnetic field vector of an electromagnetic wave is given by $$B = {B_0}{{\widehat i + \widehat j} \over {\sqrt 2 }}\cos (kz - \omega t)$$; where ...

JEE Main 2021 (Online) 27th August Morning Shift

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 thi...

JEE Main 2021 (Online) 26th August Evening Shift

A light beam is described by $$E = 800\sin \omega \left( {t - {x \over c}} \right)$$. An electron is allowed to move normal to the propagation of ligh...

JEE Main 2021 (Online) 27th July Morning Shift

The relative permittivity of distilled water is 81. The velocity of light in it will be :(Given $$\mu$$r = 1)

JEE Main 2021 (Online) 25th July Morning Shift

A linearly polarized electromagnetic wave in vacuum is $$E = 3.1\cos \left[ {(1.8)z - (5.4 \times {{10}^6})t} \right]\widehat iN/C$$is incident normal...

JEE Main 2021 (Online) 22th July Evening Shift

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?($${\varepsil...

JEE Main 2021 (Online) 20th July Evening Shift

In an electromagnetic wave the electric field vector and magnetic field vector are given as $$\overrightarrow E = {E_0}\widehat i$$ and $$\overrighta...

JEE Main 2021 (Online) 18th March Evening Shift

A plane electromagnetic wave propagating along y-direction can have the following pair of electric field $$\left( {\overrightarrow E } \right)$$ and m...

JEE Main 2021 (Online) 18th March Morning Shift

A plane electromagnetic wave of frequency 100 MHz is travelling in vacuum along the x-direction. At a particular point in space and time, $$\overright...

JEE Main 2021 (Online) 16th March Morning Shift

A plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along y-direction. At a particular point in space and time, $$\overrightarro...

JEE Main 2021 (Online) 16th March Morning Shift

For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue) and magnetic (Um) fields is :...

JEE Main 2021 (Online) 24th February Evening Shift

Match List - I with List - II.
List I
List II
(a)
Source of microwave frequency
(i)
Radioactive decay of...

JEE Main 2020 (Online) 6th September Evening Slot

For a plane electromagnetic wave, the magnetic field at a point x and time t is
$$\overrightarrow B \left( {x,t} \right)$$ = $$\left[ {1.2 \times {{10...

JEE Main 2020 (Online) 5th September Evening Slot

The correct match between the entries in
column I and column II are :
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JEE Main 2020 (Online) 5th September Morning Slot

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 ele...

JEE Main 2020 (Online) 4th September Evening Slot

The electric field of a plane electromagnetic wave is given by
$$\overrightarrow E = {E_0}\left( {\widehat x + \widehat y} \right)\sin \left( {kz - \...

JEE Main 2020 (Online) 4th September Morning Slot

Choose the correct option relating wave lengths of different parts of electromagnetic wave spectrum:

JEE Main 2020 (Online) 3rd September Evening Slot

The electric field of a plane electromagnetic wave propagating along the x direction in vacuum is
$$\overrightarrow E = {E_0}\widehat j\cos \left( {\...

JEE Main 2020 (Online) 3rd September Morning Slot

The magnetic field of a plane electromagnetic wave is
$$\overrightarrow B = 3 \times {10^{ - 8}}\sin \left[ {200\pi \left( {y + ct} \right)} \right]\...

JEE Main 2020 (Online) 2nd September Evening Slot

In a plane electromagnetic wave, the directions
of electric field and magnetic field are
represented by $$\widehat k$$ and $$2\widehat i - 2\widehat j...

JEE Main 2020 (Online) 2nd September Morning Slot

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...

JEE Main 2020 (Online) 9th January Evening Slot

A plane electromagnetic wave is propagating
along the direction
$${{\widehat i + \widehat j} \over {\sqrt 2 }}$$
, with its polarization
along the dir...

JEE Main 2020 (Online) 9th January Morning Slot

The electric fields of two plane electromagnetic
plane waves in vacuum are given by
$$\overrightarrow {{E_1}} = {E_0}\widehat j\cos \left( {\omega t ...

JEE Main 2020 (Online) 8th January Evening Slot

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...

JEE Main 2020 (Online) 7th January Evening Slot

The electric field of a plane electromagnetic wave is given by
$$\overrightarrow E = {E_0}{{\widehat i + \widehat j} \over {\sqrt 2 }}\cos \left( {kz...

JEE Main 2020 (Online) 7th January Morning Slot

If the magnetic field in a plane electromagnetic wave is given by
$$\overrightarrow B $$ = 3 $$ \times $$ 10-8 sin(1.6 $$ \times $$ 103x + 48 $$ \time...

JEE Main 2019 (Online) 12th April Evening Slot

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 F...

JEE Main 2019 (Online) 12th April Morning Slot

An electromagnetic wave is represented by the electric field $$\overrightarrow E = {E_0}\widehat n\sin \left[ {\omega t + \left( {6y - 8z} \right)} \...

JEE Main 2019 (Online) 10th April Evening Slot

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 tran...

JEE Main 2019 (Online) 10th April Morning Slot

The electric field of a plane electromagnetic
wave is given by
$$\overrightarrow E = {E_0}\widehat i\cos (kz)cos(\omega t)$$ The corresponding magnet...

JEE Main 2019 (Online) 9th April Evening Slot

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 surf...

JEE Main 2019 (Online) 9th April Morning Slot

The magnetic field of a plane electromagnetic
wave is given by :
$$$\overline B = {B_0}\widehat i\left[ {\cos (kz - \omega t)} \right] + {B_i}\wideha...

JEE Main 2019 (Online) 8th April Evening Slot

The magnetic field of an electromagnetic wave
is given by :-
$$\mathop B\limits^ \to = 1.6 \times {10^{ - 6}}\cos \left( {2 \times {{10}^7}z + 6 \ti...

JEE Main 2019 (Online) 8th April Morning Slot

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 ...

JEE Main 2019 (Online) 12th January Evening Slot

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 :...

JEE Main 2019 (Online) 12th January Morning Slot

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 t...

JEE Main 2019 (Online) 11th January Evening Slot

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...

JEE Main 2019 (Online) 11th January Morning Slot

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...

JEE Main 2019 (Online) 10th January Evening Slot

The electric field of a plane polarized electromagnetic wave in free space at time t = 0 is given by an expression $$\overrightarrow E \left( {x,y} \r...

JEE Main 2019 (Online) 10th January Morning Slot

If the magnetic field of a plane electromagnetic wave is given by (the speed of light = 3 × 108 B = 100 × 10–6
sin $$\left[ {2\pi \times 2 \times {{...

JEE Main 2019 (Online) 9th January Evening Slot

The energy associated with electric field is (UE) and with magnetic field is (UB) for an electromagnetic wave in free space. Then : ...

JEE Main 2019 (Online) 9th January Morning Slot

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, $$\ov...

JEE Main 2018 (Online) 16th April Morning Slot

A plane electromagnetic wave of wavelength $$\lambda $$ has an intensity I. It is propagatting along the positive Y-direction. The allowed expression...

JEE Main 2018 (Offline)

An EM wave from air enters a medium. The electric fields are
$$\overrightarrow {{E_1}} $$ = $${E_{01}}\widehat x\cos \left[ {2\pi v\left( {{z \over c}...

JEE Main 2018 (Online) 15th April Evening Slot

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 ...

JEE Main 2018 (Online) 15th April Morning Slot

A monochromatic beam of light has a frequency $$v = {3 \over {2\pi }} \times {10^{12}}Hz$$ and is propagating along the direction $${{\widehat i + \wi...

JEE Main 2017 (Online) 9th April Morning Slot

The electric field component of a monochromatic radiation is given by
$$\overrightarrow E $$ = 2 E0 $$\widehat i$$ cos kz cos $$\omega $$t
Its magneti...

JEE Main 2017 (Online) 8th April Morning Slot

Magnetic field in a plane electromagnetic wave is given by
$$\overrightarrow B $$ = B0 sin (k x + $$\omega $$t) $$\widehat j\,T$$
Expression for corr...

JEE Main 2016 (Online) 10th April Morning Slot

Consider an electromagnetic wave propagating in vacuum. Choose the correct
statement :

JEE Main 2016 (Online) 9th April Morning Slot

Microwave oven acts on the principle of :

JEE Main 2016 (Offline)

Arrange the following electromagnetic
radiations per quantum in the order of
increasing energy :
A : Blue light &nb...

JEE Main 2014 (Offline)

During the propagation of electromagnetic waves in a medium :

JEE Main 2014 (Offline)

Match List - $$1$$ (Electromagnetic wave type ) with List - $$2$$ (Its association/application) and select the correct option from the choices given ...

JEE Main 2013 (Offline)

The magnetic field in a travelling electromagnetic wave has a peak value of $$20$$ $$n$$$$T$$. The peak value of electric field strength is :

AIEEE 2012

An electromagnetic wave in vacuum has the electric and magnetic field $$\mathop E\limits^ \to $$and $$\mathop B\limits^ \to $$, which are always per...

AIEEE 2006

The $$rms$$ value of the electric field of the light coming from the Sun is $$720$$ $$N/C.$$ The average total energy density of the electromagnetic w...

AIEEE 2004

An electromagnetic wave of frequency $$v=3.0$$ $$MHz$$ passes from vacuum into a dielectric medium with permittivity $$ \in = 4.0.$$ Then

AIEEE 2004

A radiation of energy $$E$$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is

AIEEE 2002

Electromagnetic waves are transverse in nature is evident by

AIEEE 2002

Which of the following are not electromagnetic waves?

## Numerical

JEE Main 2023 (Online) 31st January Morning Shift

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 o...

JEE Main 2023 (Online) 30th January Morning Shift

A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of $$24 \mathrm{~W}$$. The radius of...

JEE Main 2022 (Online) 29th July Evening Shift

Nearly 10% of the power of a $$110 \mathrm{~W}$$ light bulb is converted to visible radiation. The change in average intensities of visible radiation,...

JEE Main 2022 (Online) 29th June Evening Shift

The displacement current of 4.425 $$\mu$$A is developed in the space between the plates of parallel plate capacitor when voltage is changing at a rate...

JEE Main 2022 (Online) 29th June Morning Shift

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 ______________ $$...

JEE Main 2021 (Online) 31st August Morning Shift

The electric field in an electromagnetic wave is given by E = (50 NC$$-$$1) sin$$\omega$$ (t $$-$$ x/c)The energy contained in a cylinder of volume V ...

JEE Main 2021 (Online) 27th August Evening Shift

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 magne...

JEE Main 2021 (Online) 26th August Morning Shift

The electric field in a plane electromagnetic wave is given by $$\overrightarrow E = 200\cos \left[ {\left( {{{0.5 \times {{10}^3}} \over m}} \right)...

JEE Main 2021 (Online) 17th March Evening Shift

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 th...

JEE Main 2021 (Online) 17th March Evening Shift

Seawater at a frequency f = 9 $$\times$$ 102 Hz, has permittivity $$\varepsilon $$ = 80$$\varepsilon $$0 and resistivity $$\rho$$ = 0.25 $$\Omega$$m. ...

JEE Main 2021 (Online) 17th March Morning Shift

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 e...

JEE Main 2021 (Online) 26th February Morning Shift

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 bul...

JEE Main 2021 (Online) 25th February Evening Shift

The peak electric field produced by the radiation coming from the 8W bulb at a distance of 10 m is $${x \over {10}}\sqrt {{{{\mu _0}c} \over \pi }} {V...

JEE Main 2021 (Online) 25th February Evening Shift

The wavelength of an X-ray beam is 10$$\mathop A\limits^o $$. The mass of a fictitious particle having the same energy as that of the X-ray photons is...

JEE Main 2021 (Online) 24th February Evening Shift

An electromagnetic wave of frequency 3 GHz enters a dielectric medium of relative electric permittivity 2.25 from vacuum. The wavelength of this wave ...

JEE Main 2021 (Online) 24th February Morning Shift

An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are...

JEE Main 2020 (Online) 6th September Morning Slot

Suppose that intensity of a laser is $${{315} \over \pi }$$ W/m2. The rms electric field, in units of V/m associated
with this source is close to the ...