A small sphere is charged to a potential of 50 V and a big hollow sphere is charged to a potential of 100 V . How can you make electricity flow from the smaller sphere to the bigger one ?

Ans : Place the smaller one inside the bigger one . As potential inside a hollow conductor is same as that of its surface , the potential inside the hollow conductor is now 100 V . The potential of the smaller conductor is now 100 + 50 = 150 V . Connect the two conductors by a wire . Charge will flow from the smaller one to the bigger one as the smaller one is at 150 V and the bigger one is at 100 V .

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