Electromangnetic waves travel in a medium at a speed of `2.2xx10^8ms^-1`. The relative permeabillity of the medium is 1.0. Find the relative permitivity of the medium.

Explanation

Here, `v=2.2xx10^8md^-1, mu_r=1.0,`
`in_r=?`
`v=1/(sqrt(mu in))=1/(sqrt(mu_0mu_rin_0in_r))=1/(sqrt(mu_0in_0))xx1/(sqrt(mu_rin_r))`
`=c/(sqrt(mu_rin_r))`
or `in_r=(c^2)/(v^2mu_r)=((3xx10^8)^2)/((2.2xx10^8)^2xx1.0)=1.86`