In the space inside the large sphere, which is charged to a potential of 10,000V, all points have the same potential 10,000V. When a small sphere charged to a lower potential is introduced into this large sphere, work is done, as a result of which the small sphere is also charged to a potential of 10,000V.
212 SOLUTIONS
Thus when the smaller sphere is brought into contact with the inside surface of the larger sphere, the charge is transferred, at the same potential, from the inside surface to the outside surface of the sphere, a conductor.