The electric field for the dipole centered at the origin can be computed as
........................(2.47)
is the magnitude of the dipole moment. Once again we note that the electric field of electric dipole varies as 1/r3 where as that of a point charge varies as 1/r2.
Equipotential Surfaces
An equipotential surface refers to a surface where the potential is constant. The intersection of an equipotential surface with an plane surface results into a path called an equipotential line. No work is done in moving a charge from one point to the other along an equipotential line or surface.