Q 1378345206.     If `c` is the speed of electromagnetic waves in vacuum, their speed in a medium of dielectric constant `K` and relative permeability `mu_r` is


A

`v = frac{\mu}{\sqrt{\mu_r}}K`

B

`v =c \sqrt{\mu_r}K`

C

`v = frac{c}{\sqrt{\mu_r}}K`

D

`v = frac{K}{\sqrt{\mu_r}}c`

HINT

Speed of light in a medium `= frac{1}{\sqrt{ \in \mu}}`
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