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

Three charges 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

`(-2q) /(2+sqrt2)`

C

`-2q`

D

`+q`

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