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Q.

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

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a

8 q2

b

8 q1

c

6 q2

d

6 q1

answer is A.

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Detailed Solution

Change in potential energy (ΔU)=Uf−Ui⇒ΔU=14πε0q1q30.4+q2q30.1−q1q30.4+q2q30.5⇒ΔU=14πε08q2q3=q34πε08q2∴k=8q2
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