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Question

Two Charges Q1 and Q2  are as shown in the figure. A third charge Q3  is moved from points A to B along a circular path. Change in potential energy of the system is

  1. kQ1Q2Q3
  2. 4kQ1Q2
  3. 4kQ2Q3
  4. 23kQ2Q3


Solution

The correct option is C 4kQ2Q3
ΔU=UfUi    Uf=k[Q1Q20.6+Q2Q30.2+Q3Q10.8]ΔU=UfUi=kQ2Q3[10.21]=4kQ2Q3

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