The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacumm is equal to

Options

A. speed of light in vacuum.
B. recoprocal of speed of light in vacuum
C. the ratio of magnetic permiability to the electric susceptibility of vacuum
D. unity

Answer

b

Explanation

As `u=1/2in_0E_0^2=(B_0^2)/(2mu_0), in_0mu_0 =(B_0^2)/(E_0^2)`
or `(B_0)/(E_0)=sqrt(in_0mu_0)=1/c` where