Electrostatics Question 431

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 [MP PET 2001]

Options:

A) $ \frac{1}{4\pi {\varepsilon _{0}}}\frac{Qq}{l} $

B) $ \frac{1}{4\pi {\varepsilon _{0}}}\frac{Qq}{l^{2}} $

C) $ \frac{1}{4\pi {\varepsilon _{0}}}Qql $

D) Zero

Show Answer

Answer:

Correct Answer: D

Solution:

Potential at A and C are equal. Hence work done in moving -q charge from A to C is zero.



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