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Question

# During the propagation of electromagnetic waves in a medium

A
Electric energy density is equal to the magnetic energy density
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B
Electric energy density is double of the magnetic energy density
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C
Electric energy density is half of the magnetic energy density
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D
Both electric and magnetic energy densities are zero.
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Solution

## The correct option is A Electric energy density is equal to the magnetic energy density Electric energy density is equal to the magnetic energy density. Here, UE=12ϵoE2.....(1) and UB=B22μo.....(2) Moreover, E=cB and c=1√μoϵo In equation 1, UE=12ϵo(cB)2UE=12ϵo(1√μoϵoB)2UE=B22μo=UB Hence, option C is correct.

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