In an $E.M.$ wave the average energy density is associated with

  • A

    electric field only

  • B

    magnetic field only

  • C

    electric and magnetic fields equally

  • D

    average energy density is zero

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A plane electromagnetic wave is propagating along the direction $\frac{\hat{i}+\hat{j}}{\sqrt{2}},$ with its polarization along the direction $\hat{\mathrm{k}}$. The correct form of the magnetic field of the wave would be (here $\mathrm{B}_{0}$ is an appropriate constant)

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Which of the following is $NOT$ true for electromagnetic waves ?