Question

The velocity of electromagnetic radiation in a medium of permittivity $ \varepsilon_0 $and permeability $ \mu_0 $ is given by

• A. $ \sqrt{\frac{\varepsilon_{0}}{\mu_{0}}} $
• B. $ \sqrt{\mu_{0}\,\varepsilon_{0}} $
• C. $ \frac{1}{\sqrt{\mu_{0}\,\varepsilon_{0}}} $
• D. $ \sqrt{\frac{\mu_{0}}{\varepsilon_{0}}} $

Answer 1

Answer: (C)

Velocity of electromagnetic radiation is the velocity of light $(c), i e$
$c=\frac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}$
where $\mu_{0}$ is the permeability and $\varepsilon_{0}$ is the permittivity of free space.