Two equal but opposite point charges are held a distance D apart,and a third point charge Q is placed midway between them.When Q is released it will remain at rest because its potential energy is zero at the midpoint.

Question

Quizplus · Accepted Answer

The third charge Q will not remain at rest because, although the potential energy is zero at the midpoint, the electric field is not zero, resulting in a net force on Q.

Two Equal but Opposite Point Charges Are Held a Distance