A potential difference of 50 V is maintained between the two plates of a parallel plate condenser, separated by 5 mm of air. The energy stored in unit volume of air between the plates of the condenser is

Options

A. `4.425xx10^(-4) J//m^(3)`
B. `2.425xx10^(-4) J//m^(3)`
C. `8.425xx10^(-4) J//m^(3)`
D. `6.425xx10^(-4) J//m^(3)`

Answer

A

Explanation

`u=1/2in_(0)kE^(2)=(in_(0)kV^(2))/(2d^(2))`
`=(8.85xx10^(-12)xx1xx2500)/(2xx5xx10^(-3)xx5xx10^(-3))`
`=4.425xx10^(-4)J//m^(3)`