EASY
JEE Main
IMPORTANT
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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 EM wave travels with speed v=1μ0ϵ0.

In the light of the above statements, choose the correct answer from the options given below.

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Important Questions on Electromagnetic Waves

HARD
JEE Main
IMPORTANT
A radar sends an electromagnetic signal of electric field E0=2.25 V m-1 and magnetic field B0=1.5×10-8 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) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time t=0 from radar, then after how much time echo will reach to the radar?
EASY
JEE Main
IMPORTANT
An EM wave propagating in x-direction has a wavelength of 8 mm. The electric field vibrating y-direction has maximum magnitude of 60Vm-1. Choose the correct equations for electric and magnetic fields if the EM wave is propagating in vacuum :
HARD
JEE Main
IMPORTANT

The intensity of the light from a bulb incident on a surface is 0.22 W m-2. The amplitude of the magnetic field in this light-wave is _____ ×10-9 T

(Given : Permittivity of vacuum ϵ0=8.85×10-12 C2 N-1 m-2, speed of light in vacuum c=3×108 m s-1)

HARD
JEE Main
IMPORTANT
The displacement current of 4.425 μA is developed in the space between the plates of parallel plate capacitor when voltage is changing at a rate of 106 V s-1. The area of each plate of the capacitor is 40 cm2. The distance between each plate of the capacitor is x×10-3 m. The value of x is ,
(Permittivity of free space, ε0=8.85×10-12 C2 N-1 m-2) _______
EASY
JEE Main
IMPORTANT
Light wave travelling in air along x-direction is given by Ey=540sinπ×104x-ct V m-1. Then, the peak value of magnetic field of wave will be (Given c=3×108 m s-1)
MEDIUM
JEE Main
IMPORTANT
The magnetic field of a plane electromagnetic wave is given by B=2×10-8sin0.5×103x+1.5×1011tj^ T. The amplitude of the electric field would be
HARD
JEE Main
IMPORTANT
The oscillating magnetic field in a plane electromagnetic wave is given by By=5×10-6sin1000π5x-4×108t T. The amplitude of electric field will be
MEDIUM
JEE Main
IMPORTANT

A beam of light travelling along X-axis is described by the electric field Ey=900sinωt-xc. The ratio of electric force to magnetic force on a charge q moving along Y-axis with a speed of 3×107 m s-1 will be :

[Given speed of light =3×108 m s-1 ]