Energy Density is the total amount of energy in a system per unit volume. The Energy density of an electric field is the sum of the energy density of electric and magnetic fields, because both magnetic and electric fields are involved in creating the energy in the electric field. Find here the Electrostatic energy density formula to calculate the energy density for the given electric field. It is expressed as d=1/2(e2n), where e is the electric field and n is the constant.
In the above Energy density in electrostatic field formula substitute the value of 8.8541x10^12 F/m for the variable 'n' which is a constant.