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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

A
kQ1Q2Q3
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B
4kQ1Q2
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C
4kQ2Q3
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D
23kQ2Q3
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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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