The magnetic field in a plane \( \mathrm{EM} \) wave is given by \( B=(200 \mu \mathrm{T}) \sin ...

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The magnetic field in a plane \( \mathrm{EM} \) wave is given by \( B=(200 \mu \mathrm{T}) \sin \left(4.0 \times 10^{-5} \mathrm{~s}^{-1}\left(t-\frac{x}{c}\right)\right. \)
Find the average energy density corresponding to the electric field.
(a) \( 0.085 \mathrm{Jm}^{-3} \)
(b) \( 0.008 \mathrm{Jm}^{-3} \)
(c) \( 0.06 \mathrm{Jm}^{-3} \)
(d) \( 0.006 \mathrm{Jm}^{-3} \)
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