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In a certain charge distribution, all po...

In a certain charge distribution, all points having zero potetnial can be joined by a circles `S`. Points inside `S` have positive potential and points outside `S` have negative potential. A positive charg, 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

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