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

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Three charges `Q, + q and + q` are placed at the verticles of a right-angled triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to .....
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(a) –2q (b) `(–q)/(1 + sqrt2)` (c) + q (d) `(–2q)/(2 + sqrt2)`

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