Question

The ration of amplitude of magnetic fields to the amplitude of electric fields for an electromagnetic wave propagating vacuum is equal to

• A. The speed of light in vacuum
• B. Reciprocal of speed of light in vacuum
• C. The ratio of magnetic permeability to the electric susceptibility of vacuum
• D. Unity

Answer 1

Answer: (B)

Reciprocal of speed of light in vacuum

Answer 2

: The amplitudes of electric field and magnetic field for an electromagnetic wave propagating in vacuum are related as $E_{0} = B_{0}c$

Where c is the speed of light in vacuum.

$\therefore\frac{B_{0}}{E_{0}} = \frac{1}{c}$