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Three point charges q are placed on vert...

Three point charges `q` are placed on vertices of an equilateral triangle of side length `a`. The charge `Q` that should be kept at centroid of triangle such that the system is in equilibrium is equal to

A

`-qsqrt3`

B

`-3q`

C

`-q/sqrt3`

D

`q/sqrt3`

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