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

Give C = 2`xx 10^(8)` m /sec, `mu_(r)` = 1
speed of EM waves in medium
`C_("med") = (1)/(sqrt(mu_(r)mu_(0) epsilon_(r)epsilon_(0))) = (C_(0))/(sqrt(mu_(r) epsilon_(r)))`
, `epsilon_(r) = (c_(0)^(2))/(c^(2)mu_(r ) ) = ((3 xx 10^(8))^(2))/((2 xx 10^(8))^(2)xx 1) = 2.25`