Electromagnetic Waves

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of \(2.0 \times 10^{10} \mathrm{~Hz}\) and amplitude \(48 ~\mathrm{Vm}^{-1}\). Then the amplitude of oscillating magnetic field is : (Speed of light in free space \(=3 \times 10^{8} \mathrm{~m} \mathrm{~s}^{-1}\) )