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
BIt can move inside $S$, but it cannot cross $S$
CIt must cross $S$ at some time
D
It may move, but will ultimately return to its starting point
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CIt must cross $S$ at some time
c (c) A free positive charge move from higher (positive) potential to lower (negative) potential. Hence, it must cross $S$ at some time.
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