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2q and 3q are two charges separated by a distance 12 cm on x-axis. A third charge q is placed at 5 cm on y-axis as shown in figure. Find the change in potential energy of the system if 3q is moved from initial position to a point on X-axis in circular path:

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a

q24πεo

b

6q24πεo(91)

c

18q24πεo(91)

d

3q24πεo

answer is C.

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Detailed Solution

ΔU=Uf−Ui and U=14πε0q1q2r

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2q and 3q are two charges separated by a distance 12 cm on x-axis. A third charge q is placed at 5 cm on y-axis as shown in figure. Find the change in potential energy of the system if 3q is moved from initial position to a point on X-axis in circular path: