Physics · Electrostatic Potential

Consider the following four statements regarding energy stored in a parallel-plate capacitor with plate area \( A \) and separation \( d \): (A) The electrostatic potential energy is stored in the electric field between the plates. (B) The volume of the region where the electric field exists is \( A d \). (C) The electrostatic energy density per unit volume is proportional to \( E^2 \). (D) Electrostatic force is non-conservative, which is why energy is dissipated when charges are built on the plates. How many of the above statements are correct?

1. A
   Only one
2. B
   Only two
3. C
   Only three
4. D
   All four