For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric $(U_{e})$ and magnetic $(U_{m})$ fields is:

U_{e} \neq U_{m}

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U_{e} = U_{m}

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U_{e} > U_{m}

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U_{e} < U_{m}

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Solution

The correct option is B $U_{e} = U_{m}$
In EMW, average energy density due to electric field $(U_{e})$ and magnetic field $(U_{m})$ is same.
Hence option (b) is correct.

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