Joint Entrance Examination/2000 Screening/Q017 Electrostats - energy of a configuration

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Original Question by Dharav talk Here's the question... 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... ${\frac {-q}{1+{\sqrt {2}}}}$ ${\frac {-2q}{2+{\sqrt {2}}}}$ $-2q$ $+q$ Posted by Dharav talk 04:46, 18 August 2009 (UTC)

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