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?

  • 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

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