
Given two electrostatic equal but opposite charges which are close to each other (an electrostatic dipole). The equipotential is then formed by the dipole curve ^{1)}. The equation in Cartesian coordinates can be written as (x^{2} + y^{2})^{3} = x^{2}.
1) Let charges be at A and B on the xaxis, and P being the point for which the potential is calculated. 