1. The problem statement, all variables and given/known data A point charge q is placed at a distance 2r from the centre O of a conducting charged sphere of radius r. Due to the induced charges on the sphere, find the electric potential at point P on the surface of sphere(it is at a distance 3r from q) (if Kq/r = 18 volt) 2. Relevant equations 3. The attempt at a solution Due to the induced charges the potential will be 0 as there are as many -ve charge on the surface of sphere as that of +ve charge. So the net potential is due to q which comes out to be 6 but correct answer is 3.