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  4. In a certain charge distribution, all points having zero potential can be joined by a circle an S. Points inside S have positive potential points outside S have negative potential. A positive charge, which is free to move, is placed inside S:

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Q. In a certain charge distribution, all points having zero potential can be joined by a circle an $S$. Points inside $S$ have positive potential points outside $S$ have negative potential. $A$ positive charge, which is free to move, is placed inside $S$:

Delhi UMET/DPMTDelhi UMET/DPMT 2004

Solution:

A free positive charge can move from higher (positive) potential to lower (negative) potential.
Hence, it must cross $S$ at some time.