# 10.(c) In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of   and amplitude .Show that the average energy density of the E field equals the average energy density of the B field.

The average energy density of the Electric field(UE

=                 (as E=Bc)

=

=U

Therefore the average energy density of the electric field is equal to the average energy density of the Magnetic field.

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