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Q.

Two charges q1 and q2  are placed 30cm apart shown in the figure.  A  third charge q3 is moved along the arc of a circle of radius 40cm from C to D.  The change in the potential energy of the system is  q34πε0k Where k  is

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a

8q2

b

8q1

c

6q2

d

6q1

answer is A.

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Detailed Solution

Change in potential energyΔU=Uf−Ui=ΔU=14πε0q1q30.4+q2q30.1+q1q20.3−q1q30.4+q2q30.5+q1q20.3             = q3q284πε0
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