(i) Can two equaipotential surfaces intersect each other ? Give reasons
(ii) Two charges `-q and +q` are located at point A (0, 0 -a) and B(0, 0, +a) respectively. How much work is done in moving a test charge from point `P (7, 0, 0) " to " Q(-3, 0, 0)` ?

Explanation

(i) No, if two equipotential surfaces intersect then at the point of intersection two tangents can be drawn and there will be two directions of electric field intensity which is not possible.
(ii) Since both the points are in the equatorial line of the dipole and V = 0 at every point on it, work done will be zero. Also the force on any charge is perpendicular to the equatorial line, so work done is zero.