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Three charge Q, +q and +q are placed at ...

Three charge `Q, +q` and `+q` are placed at the vertices of a right angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero, if `Q` is equal to

A

`(-q)/(1+sqrt2)`

B

`(-sqrt2q)/(1+sqrt2)`

C

`-2q`

D

`+q`

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The correct Answer is:
C
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