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 $S$
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
- 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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- [IIT 1983]