The electric field of a plane electromagnetic wave varies with time of amplitude $2\, Vm^{-1}$ propagating along $z$ -axis. The average energy density of the magnetic field (in $J\, m^{-3}$) is
The electric field of a plane electromagnetic wave varies with time of amplitude $2\, Vm^{-1}$ propagating along $z$ -axis. The average energy density of the magnetic field (in $J\, m^{-3}$) is
- A
$13.29 \times 10^{-12}$
- B
$8.86 \times 10^{-12}$
- C
$17.72 \times 10^{-12}$
- D
$4.43 \times 10^{-12}$
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