A medium has relative permittivity 1 / 0.085 and relative permeability is 10 / π.

Question

A medium has relative permittivity \(\frac{1}{0.085}\) and relative permeability is \(\frac{10}{\pi}\) . Find ratio of speed of light in vacuum to the medium.

(1) 6.12

(2) 3.14

(3) 2.28

(4) 1.27

Answer 1

Correct option is : (1) 6.12

\(\frac{c}{v} = \mu\)

\(\mu = \sqrt{\varepsilon_\gamma\mu_\gamma}\)

\( = \sqrt{\frac{1}{0.085}\times \frac{10}{\pi}}\)

\( = \sqrt{37.46}\)

= 6.12