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

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