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Questions  

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
14πε0  lq
b
14πε0Qql2
c
14πε0Qql
d
zero

detailed solution

Correct option is D

According to figure, potential at A and Care equal. Hence work done in moving -q charge from A to C is zero

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