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

Three charges +q , +q, and Q are placed at the comers of a right angled isosceles triangle as shown in the figure. If the net potential energy of the system is zero then value of Q is

A

`-2q`

B

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

C

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

D

`-q`

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