The electric field of a plane electromagnetic wave varies with time of amplitude `2Vm^-1` propagating along z-axis. The average energy density of the magentic field is (in `Jm^-3`)

Options

A. 13.29 `X 10^(-12)`
B. `8.86 X 10^(-12)`
C. `17. 72 x 10^(-12)`
D. ` 4.43 x 10^(-12)`

Answer

B

Explanation

`U = (1)/(2) xx (1)/(2) epsilon_(0) E^(2)`