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
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
- [IIT 2000]
- A
$\frac{{ - q}}{{1 + \sqrt 2 }}$
- B
$\frac{{ - 2q}}{{2 + \sqrt 2 }}$
- C
$ - 2q$
- D
$ + q$
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- [AIEEE 2006]
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