Question

The speed of an electromagnetic wave in a material medium of permeability $\mu$ and permittivity $\epsilon$ is

• A. $\frac{1}{\mu \epsilon }$
• B. $\frac{1}{2\mu \epsilon }$
• C. $\frac{1}{\sqrt{\mu \epsilon }}$
• D. $\frac{1}{\sqrt{2\mu \epsilon }}$
• E. $\frac{2}{\mu \epsilon }$

Answer 1

The correct option is C $\frac{1}{\sqrt{\mu \epsilon }}$

it is known that the speed of light in free space is related to the permittivity and permeability of a medium

it is given by

$c=\frac{1}{\sqrt{\mu ϵ}}$ in free space