Question

9.Two point charges +Q1 and -Q2 are placed r distance apart. Obtain the expression for the
amount of work done to place a third charge Q3 at the mid point of the line joining the
two charges. At what distance from +Q1 on the line joining the two charges ( in terms of
Q1, Q2 and r) will this wok done be zero.

Answer 1

Answer:

The points A and B will have the equal distance because every point in the circumference of a circle will have equal distances from the centre which is +q.

Due to the charge of the centre of the circle, every point at the circumference will be at equipotential.

As there is no transformation of potential energy in moving a charge in the equipotential path, there is no work done or say, the work done is zero.

Explanation:

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