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For an electromagnetic wave travelling i...

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

A

`U _(e) ne U _(m)`

B

`U _(e) = U _(m)`

C

`U _(e) lt U _(m)`

D

`U _(e) gt U _(m)`

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