In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential, and points outside S have negative potential. A positive charge, which is free to move, is placed inside S. (a) It will remain in equilibrium. (b) It can move inside S, but it cannot cross S. (c) It must cross S at some time. (d) It may move, but will ultimately return to its starting point.

In a certain charge distribution, all points having zero potential can

1.	In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential, and points outside S have negative potential. A positive charge, which is free to move, is placed inside S. (a) It will remain in equilibrium. (b) It can move inside S, but it cannot cross S. (c) It must cross S at some time. (d) It may move, but will ultimately return to its starting point.
Answer» Correct Answer is (c) It must cross S at some time.

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