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Three point charges Q, Q and q are kept ...

Three point charges Q, Q and q are kept at the vertices A, B and C respectively of an equilateral triangle ABC having each side equal to a. Electrostatic potential Energy of the system is zero. This is possible if q is equal to :

A

Q

B

`Q//2`

C

`-Q//2`

D

`+Q//2`

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