Calculate the energy per unit volume of a medium of dielectric constant 3, if the intensity of the electric field is `100V//m`.

Options

A. `1.328xx10^(-8) J//m^(3)`
B. `4.2xx10^(-8) J//m^(3)`
C. `13.28xx10^(-8) J//m^(3)`
D. `42xx10^(-8) J//m^(3)`

Answer

C

Explanation

`u=1/2in_(0)kE^(2)=(8.85xx10^(-12)xx3xx10^(4))/2`
`=13.28xx10^(-8)J//m^(3)`