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Two charges Q subscript 1 end subscript and Q subscript 2 end subscript Coulombs are shown in fig. A third charge Q subscript 3 end subscript coulomb is moved from point R to S along a circular path with P as centre. Change in potential energy is

  1. fraction numerator 1 over denominator 4 pi end fraction Q subscript 1 end subscript Q subscript 2 end subscript Q subscript 3 end subscript    
  2. fraction numerator Q subscript 1 end subscript Q subscript 2 end subscript over denominator pi end fraction    
  3. fraction numerator Q subscript 2 end subscript Q subscript 3 end subscript over denominator pi end fraction    
  4. fraction numerator 4 Q subscript 1 end subscript Q subscript 2 end subscript over denominator pi end fraction    

The correct answer is: fraction numerator Q subscript 2 end subscript Q subscript 3 end subscript over denominator pi end fraction

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