Electromagnetic Waves

JEE Main 2025 (Online) 23rd January Evening ShiftMCQEasy📈 Topic in 61% papers+4−1

Ques. 1JEE Main 2025, 23 January (Evening Shift)

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 Ey=9.3 V m-1. Then, the magnetic field vector of the wave at that point is

Bz=1.55 10-8 T
Bz=6.2 10-8 T
Bz=3.1 10-8 T
Bz=9.3 10-8 T

Answer

(3) Bz=3.1 10-8 T

Solution

In free space B= Ec= 9.33 108=3.1 10-8 T.

[figure]

E B must point along the travel direction +x: j k= i, so B is along +z.

Bz=3.1 10-8 T

Answer: (3)

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Ques. 2JEE Main 2025, 23 January (Evening Shift)

A time varying potential difference is applied between the plates of a parallel plate capacitor of capacitance 2.5 . The dielectric constant of the medium between the capacitor plates is 1 . It produces an instantaneous displacement current of 0.25 mA in the intervening space between the capacitor plates, the magnitude of the rate of change of the potential difference will be V s-1.

Ques. 3JEE Main 2025, 22 January (Evening Shift)

A parallel plate capacitor of area A=16 cm2 and separation between the plates 10 cm , is charged by a DC current. Consider a hypothetical plane surface of area A0=3.2 cm2 inside the capacitor and parallel to the plates. At an instant, the current through the circuit is 6A. At the same instant the displacement current through A0 is mA .

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