The magnetic field in a plane electromagnetic wave is given by `B= (200 (mu) T) sin [(4.0 xx (10^15)(s^-1)(t-(x/c))]`. Find the maximum electric field and the average energy density corresponding to the electric field .

Options

A. 0.016 J/`m^(3)`
B. 0.015 J /`m^(3)`
C. 0.014 J /`m^(3)`
D. 0.02 J /`m^(3)`

Answer

A

Explanation

u = `(B_(0)^(2))/(4 mu_(0))`