Question

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

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

Answer 1

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

The relation between the magnitude of electric field and the magnitude of magnetic field is given by

$E_0=B_{0}c$

$\frac{B_0}{E_0}=\frac{1}{c}$ (Reciprocal of speed of light in vacuum)

The correct option is B.