Question

A large conducting plane has a surface charge density $1.0\times {10}^{-4}C{m}^{-2.}$ Find the electrostatic energy stored in a cubical volume of edge 1.0 cm in front of the plane.

Answer 1

$r=1\times {10}^{-4}c/m^2.a=1cm=1\times {10}^{-2}m,a^3={10}^{-6}m$

The energy stored in the plane = 564.97

The necessary electrostatic energy stored in a cubical volume of edge 1 cm in fron tof the plane.

$=E{a}^3$

$=564\times {10}^{-6}J$

$=5.65\times {10}^{-4}J.$