(i) Can two equpotential surfaces intersect each other ? Give reason.
(ii) Two charges `+ q and -q` are located at points A `(0, 0, -2) and B(0, 0, 2)` respectively. How much work will be done in moving a test charge from point P`(4, 0, 0) " to " (-5, 0,0)` ?

Answer

Zero

Explanation

As is clear from Fig, dipole moment `vec(p)` is along `vec(BA)`. Test charge is to be moved from p to Q along negative x-axis. As electric intensity is perpendicular to displacementm `vec(ds)`.
`:. W = qE" ds "cos 90^(@)` = Zero