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Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the midpoint. The potential energy of the system is

a
q28πε0a
b
6q28πε0a
c
-7q28πε0a
d
9q28πε0a

detailed solution

Correct option is C

Usystem =14πε0(q)(-2q)a+14πε0(-2q)(q)a+14πε0(q)(q)2a Usystem =-7q28πε0a

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