The refractive index and the permiability of a medium are respectively 1.5 and `5xx10^-7Hm^-1`. The relative permitivity of the medium is nearly

Options

A. `81`
B. `10`
C. `6`
D. `15`

Answer

c

Explanation

Refractive index, n=c/v
or `v=c/v=(3xx10^8)/1.5=2xx10^8m//s`
Here, `mu=5xx10^-7 mu m^-1,`
`v=1/(sqrt(mu in))=1/(sqrt(mu in_0in_r))`
`:. in_r=1/(v^2 mu in_0)`
`=1/((2xx10^8)^2xx(5xx10^-7)xx(8.85xx10^(-12))`
`=5.63~~6`