700 pJ of energy is stored in a 100 cm 100 cm 100 cm regio

70.0 pJ of energy is stored in a 1.00 cm × 1.00 cm × 1.00 cm region of uniform electric field.

What is the electric field strength?

Solution

The energy density of an electrostatic field is given by:

W/v = ½ o E²

The energy stored in the 1 cubic meter volume of space is:

W = (½ o E² )v

where, volume: v = 1 m³.

Therefore, the field strength is: E

E = {2 W / o} = { 2*50x10^-12 / 8.85x10^-12} = { 100/8.85} = 3.36 N/C