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(C) The energy density due to the electric field is given by $u_E = \frac{1}{2} \epsilon_0 E^2$.The energy density due to the magnetic field is given

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Equally with both electric and magnetic fields

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(C) The energy density due to the electric field is given by $u_E = \frac{1}{2} \epsilon_0 E^2$.The energy density due to the magnetic field is given by $u_B = \frac{1}{2} \frac{B^2}{\mu_0}$.In an electromagnetic wave,the relationship between the electric field $E$ and the magnetic field $B$ is $E = cB$,where $c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}$.Substituting $c^2 = \frac{1}{\mu_0 \epsilon_0}$ into the energy density expressions,we find that the average energy density contributed by the electric field is equal to the average energy density contributed by the magnetic field.Therefore,the total average energy density is shared equally between the electric and magnetic fields.

In electromagnetic waves,the average energy density is associated with what?

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