Q: If A and B are two equipotential surfaces around a positive point charge q, what will happen if we place another point charge +Q between A and B?  

Answer: C

A positive charge will move from a region of higher potential to a region of lower potential. Since the potential decreases as we move away from the positive point charge, the charge placed between A and B will experience a force that pushes it towards B, causing it to move from A to B.

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