Question

Velocity of electromagnetic waves in a medium depends

• A. only on the electrical properties of the medium
• B. only on the magnetic properties of the medium
• C. only on the mechanical properties of the medium
• D. on none of these

Answer 1

The correct option is D

on none of these

Velocity of an electromagnetic wave

1. The velocity of an electromagnetic wave in a medium can be written as:
2. $v=\frac{1}{\sqrt{\mu \epsilon }}$Where, $\mu$ is the permeability of the medium and $\epsilon$ is the permittivity of the medium.
3. The permeability of a medium is a measure of how much a medium can be magnetized with an external magnetic field.
4. The permittivity of a medium is a measure of how much a medium can be electrically polarized with an external electric field.
5. Thus, the velocity of an electromagnetic wave in a medium depends both on the magnetic and electrical properties of the medium.

Hence, the correct option is (d).