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The Speed of EM Waves

Which of the ...

Question

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

A

Electric field

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B

Magnetic field

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C

Electric energy

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D

Magnetic energy

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Solution

The correct option is B Magnetic field
We know that
$E_{x} = E_{0} sin (k z - ω t)$
$B_{y} = B_{0} sin (k z - ω t)$
Since both are function of $^{'} s i n^{'}$
Therefore have their average value as zero

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