Three charges Q- -q and -q are placed the vertices of a right-angled isosceles triangle as shown- The net electrostatic energy of the configuration is zero Q is equal to-dfrac - -q - 1-sqrt - 2 - -dfrac - -sqrt2q - 1-sqrt - 2 - -2q-q

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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:−q1+√2−√2q1+√2−2q+q

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:

$\frac{- q}{1 + \sqrt{2}}$
$\frac{- \sqrt{2} q}{1 + \sqrt{2}}$
$- 2 q$
$+ q$