question_answer

If c is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant K and relative permeability\[{{\mu }_{r}}\]is:

A)  \[v=\frac{1}{\sqrt{{{\mu }_{r}}K}}\]       

B)         \[v=c\sqrt{{{\mu }_{r}}K}\]

C)  \[v=\frac{c}{\sqrt{{{\mu }_{r}}K}}\]       

D)         \[v=\frac{K}{\sqrt{{{\mu }_{r}}c}}\]

E)  \[v=\frac{{{\mu }_{r}}}{\sqrt{cK}}\]