SIr, Can u help me solving this one...
A short electric dipole of moment p is placed in a uniform electric field of E_0. In this case, one of the eqipotential sufaces enclosing the dipoles makes a sphere. Find the radius of such sphere

i thnk the radius of the sphere enclosing the  dipole will be dependent on how big the sphere is i.e. whether it just takes in the dipole exactly at its terminal points i.e. the lenght 2a is the diameter of the sphere , then the radius will be a. or else the radius can be found out only when the potential at that surface is given alog with the charge in the dipole.......