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Which of the ...

Question

Which of the following has/have zero average value in a plane electromagnetic wave?

A

Both magnetic and electric fields

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B

Electric fields only

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C

Magnetic field only

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D

None of these

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Solution

The correct option is A Both magnetic and electric fields
Both electric and magnetic field have sinusoidal nature in a plane electromagnetic wave. As we know, the average value of a sinusoidal wave is zero, so both magnetic and electric fields have average values zero.

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