General Science MCQs

Physics ? EM Waves Questions with solutions MCQs

1. Linearly polarized EM wave: 1. Electric and magnetic fields equal average values. 2. Electric and magnetic energy have equal average values. Choose correct.

A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither

Physics ? EM Waves J.E Civil (SD) 2025
Correct Answer : C
Explanation :

In a plane EM wave, E and B have equal average energy densities.

Correct Answered :

Wrong Answered :

2. If EM wave with amplitude 1 V/m, permittivity 4, find time-average power density vector magnitude.

A

30 W/m?

B

60 W/m?

C

120 W/m?

D

240 W/m?

Physics ? EM Waves J.E Civil (SD) 2025
Correct Answer : A
Explanation :

Using Poynting vector formula, the average works out to 30 W/m?.

Correct Answered :

Wrong Answered :

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