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. 25
B. 15
C. 81
D. 6

Answer

D

Explanation

n `= sqrt(epsilon_(r ) mu_(r )) = sqrt((mu epsilon)/(mu_(0) epsilon_(0)))`
and v = `(c )/(n) `
`rArr " " (epsilon)/(epsilon_(0)) = (9 xx 10^(16))/(4 xx 10^(16)) xx (4 pi xx 10^(-7))/(5 xx 10^(-7)) = 5.6 = 6. `