The `rms` value of electric field of a plane electromagnetic wave is `314V//m`.The average energy density of electric field and the average energy density are

Options

A. `4.3xx10^(-7) Jm^(-3)`, `2.15xx10^(-7) Jm^(-3)`
B. `4.3xx10^(-7) Jm^(-3)`, `8.6xx10^(-7) Jm^(-3)`
C. `2.15xx10^(-7) Jm^(-3)`, `4.3xx10^(-7) Jm^(-3)`
D. `8.6xx10^(-7) Jm^(-3)`, `4.3xx10^(-7) Jm^(-3)`

Answer

B

Explanation

`(U_(av))_(E)=(1)/(2)epsilon_(0)E_(max)^(2)`, `U_(av)=epsilon_(0)E_(max)^(2)`