Question

The velocity of electromagnetic radiation in a medium of permittivity ${\epsilon }_0$and permeability ${\mu }_0$ is given by

• A. $\sqrt{\frac{{\epsilon }_0}{{\mu }_0}}$
• B. $\sqrt{{\mu }_0{\epsilon }_0}$
• C. $\frac{1}{\sqrt{{\mu }_0{\epsilon }_0}}$
• D. $\sqrt{\frac{{\mu }_0}{{\epsilon }_0}}$

Answer 1

Answer: (C)

Velocity of electromagnetic radiation is the velocity of light $(c),ie$
$c=\frac{1}{\sqrt{{\mu }_0{\epsilon }_0}}$
where ${\mu }_0$ is the permeability and ${\epsilon }_0$ is the permittivity of free space.