CUET · PHYSICS · PYQ PAPER 2025
The following have zero average value in a plane electromagnetic wave
- A electric field only
- B magnetic field only
- C both electric field and magnetic field
- D both electric energy and magnetic energy
Answer & Solution
Correct Answer
(C) both electric field and magnetic field
Step-by-step Solution
Detailed explanation
In a plane electromagnetic wave, both the electric and magnetic fields oscillate sinusoidally. Over a complete cycle, the positive and negative values cancel out, resulting in a zero average value for both.
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