Which one of the following is a property of a monochromatic, plane electromagnetic wave in free space?
A
Electric and magnetic fields have a phase difference of π/2
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B
The energy contribution of both electric and magnetic fields are equal
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C
The direction of propagation is in the direction of ¯¯¯¯Bׯ¯¯¯E
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D
The pressure exerted by the wave is the product of its speed and energy density.
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Solution
The correct option is B The energy contribution of both electric and magnetic fields are equal The energy contribution of both electric and magnetic fields are equal, Energy density is written as E=12ϵ0E2=B22μ0
And the direction of propagation of wave is written as ^V=^E×^B