Physics > magnetism-induction-and-alternating-current > Electromagnetic Waves

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