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Question

A charge (-q) and another charge (+Q) are kept at two points A and B respectively. Keeping the charge (+Q) fixed at B, the charge (-q) at A is moved to another point C such that ABC forms an equilateral triangle of side l. The net work done in moving the charge (-q) is?

A
14πϵ0Qql
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B
14πϵ0Qql2
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C
14πϵ0Qql
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D
Zero
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Solution

The correct option is D Zero
According to figure, potential at A and C are equal. Hence work done in moving – q charge from A to C is zero.

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