The magnitude of the electric field of a plane electromagnetic wave travelling in free space is $E$. If $\mu_0$ and $\varepsilon_0$ are respectively permeability and permittivity of the free space, then the magnitude of magnetic field of the wave is

• A

  $E \mu_0 \varepsilon_0$
• B

  $\frac{E}{\mu_0 \varepsilon_0}$
• Correct answer
  C

  $E \sqrt{\mu_0 \varepsilon_0}$
• D

  $\frac{E}{\sqrt{\mu_0 \varepsilon_0}}$

Hence, the correct answer is option: 'C'.