Question

The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to

• A. reciprocal of speed of light in vacuum.
• B. the ratio of magnetic permeability to the electric susceptibility of vacuum.
• C. unity.
• D. the speed of light in vacuum.

Answer 1

Answer: (A)

reciprocal of speed of light in vacuum.

We know that,

$c=\frac{E_0}{B_0}$, where $c$ is the velocity of light.

$\frac{B_0}{E_0}=\frac{1}{c}$