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Q.

For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue) and magnetic (Um) fields is:

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a

Ue>Um

b

Ue=Um

c

UeUm

d

Ue<Um

answer is B.

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Detailed Solution

<Magnetic field energy density >=<Electric Field energy density >

Both have equal contribution to EMW.

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