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(C) In an electromagnetic wave,energy is carried by both the oscillating electric field and the oscillating magnetic field.The energy density associat

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Both $(a)$ and $(b)$

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(C) In an electromagnetic wave,energy is carried by both the oscillating electric field and the oscillating magnetic field.The energy density associated with the electric field is given by $u_E = \frac{1}{2} \varepsilon_0 E^2$.The energy density associated with the magnetic field is given by $u_B = \frac{1}{2} \frac{B^2}{\mu_0}$.The total energy density $u$ is the sum of these two: $u = u_E + u_B = \frac{1}{2} \varepsilon_0 E^2 + \frac{1}{2} \frac{B^2}{\mu_0}$.Therefore,the energy stored in electromagnetic oscillations is in the form of both electrical and magnetic energy.

Energy stored in electromagnetic oscillations is in the form of

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