A hollow, conducting sphere is initially uncharged. A positive charge, +q1, is p

Question

A hollow, conducting sphere is initially uncharged. A positive charge, +q1, is placed inside the sphere, as shown in the figure. Then, a second positive charge, +q2, is placed near the sphere but outside it. Which of the following statements describes the net electric force on each charge?

A. Both charges are acted on by a net electric force with the same magnitude and in the same direction, to the right.

B. There is no net electric force on either charge.

C. There is a net electric force on +q2 but not on +q1

D. There is a net electric force on +q1 but not on +q2.

E. Both charges are acted on by a net electric force with the same magnitude but in opposite directions

Explanation / Answer

E. is correct
Proof:

On the hollow conducting sphere electrical charges of the same magnitude are induced on the inner and outer surfaces of the sphere. On the inner surface a negative one, and positive on the outer surface.

Th net charge on the sphere is then equal zero, and charges ineteract as if the sphere does not exist

So that both charges are acted on by a net electric force with the same magnitude but in opposite directions.

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