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(C) positive charge naturally moves from a region of higher potential to a region of lower potential.Since the potential inside the circle $S$ is posi

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It must cross $S$ at some time

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(C) positive charge naturally moves from a region of higher potential to a region of lower potential.Since the potential inside the circle $S$ is positive and the potential outside is negative,the electric field lines will point from the inside to the outside.Therefore,a free positive charge placed inside $S$ will experience an electric force directed towards the outside of $S$.As a result,the charge will move from the region of positive potential to the region of negative potential,meaning it must cross the circle $S$ at some time.

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 $S$. What will happen to the charge?

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