Electro magnetic waves travel in a medium with speed of `2xx10^(8)m//sec`. The relative permeability of the medium is `1` find relative permittivity.

Explanation

`C’=(1)/(sqrt(muC))=(1)/(sqrt(mu_(0)mu_(r)epsilon_(0)epsilon_(r)))=(C)/sqrt(mu_(r)epsilon_(r))`
`epsilon_(r)=(C^(2))/(C.^(2)mu_(r))=((3)/(2))^(2)=2.25`.