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Three charges Q, (+q) and (+q) are place...

Three charges `Q, (+q)` and `(+q)` are placed at the vertices of an equilateral triangle of side `l` as shown in the figure. It the net electrostatic energy of the system is zero, then `Q` is equal to

A

`(-q//2)`

B

`-q`

C

`+q`

D

zero

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The correct Answer is:
A
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