In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of $2.0\times {10}^{10}\mathrm{H}\mathrm{z}$ and amplitude $48{\mathrm{V}\mathrm{m}}^{-1}$ . Then the amplitude of oscillating magnetic field is:

(Speed of light in free space $=3\times 108{\mathrm{m}\mathrm{s}}^{-1}$  )

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