A small electric dipole with a dipole moment is placed in an external electric field which is parallel to the dipole, that is, It turns that in this case one of the equipotential surfaces enclosing the dipole is a sphere. Find the radius in meters of this sphere. The electric potential created by a point dipole at a point P is given by the formula where is the radius vector from the center of the dipole to the point P.
Details and assumptions