Physics-
General
Easy

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

  1. fraction numerator 1 over denominator 4 pi epsilon subscript 0 end subscript end fraction fraction numerator Q q over denominator l end fraction    
  2. fraction numerator 1 over denominator 4 pi epsilon subscript 0 end subscript end fraction fraction numerator Q q over denominator l to the power of 2 end exponent end fraction    
  3. fraction numerator 1 over denominator 4 pi epsilon subscript 0 end subscript end fraction Q q l    
  4. Zero    

The correct answer is: 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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