Electrostatic Potential And Capacitance

Energy density in the energy per unit volume.
The energy per unit volume or the energy density is given, by,

Where is permittivity of free space and is electric field.
Also

From Eqs. (1) and (2), we have

Given, Volt,

,



Note: We can also say that if electric field exists in some space, then the space is a store of energy whose amount per unit volume is equal to energy density.

Capacitive reactance






Peak vaiue of charge