Question

Choose the correct answer from the alternatives given:
The ratio of the 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

The correct option is A Reciprocal of speed of light in vacuum

The ratio of the electric field on an electromagnetic wave to its magnetic field is given by:

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

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

Option$\left(A\right)$ is correct.