Electromagnetic Waves

JEE Main 2024 (Online) 27th January Morning ShiftMCQEasy📈 Topic in 64% papers+4−1

Ques. 1JEE Main 2024, 27 January (Morning Shift)

A plane electromagnetic wave propagating in x-direction is described by Ey = (200 V m-1 ) [1.5 107 t - 0.05x ]; The intensity of the wave is : (Use 0 = 8.85 10-12 C2 N-1 m-2)

35.4 W m-2
53.1 W m-2
26.6 W m-2
106.2 W m-2

Answer

(2) 53.1 W m-2

Solution

I = 12 0 E02 c

I = average energy density × speed; here E0 = 200 V m-1

I = 12 8.85 10-12 (200)2 3 108

= 12 8.85 4 3

= 53.1 W m-2

Answer: (2)

Keep practising — Electromagnetic Waves

Ques. 2JEE Main 2024, 27 January (Evening Shift)

An object is placed in a medium of refractive index 3 . An electromagnetic wave of intensity 6 108 W/m2 falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space =3 108 m/s ) :

6 Nm-2
36 Nm-2
18 Nm-2
2 Nm-2

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