Three charges \( \mathrm{Q},+\mathrm{q} \) and \( +\mathrm{q} \) are placed at the vertices of a...

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Three charges \( \mathrm{Q},+\mathrm{q} \) and \( +\mathrm{q} \) 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
\( P \) equal to

W
(1) \( \frac{-q}{1+\sqrt{2}} \)
(2) \( \frac{-2 q}{2+\sqrt{2}} \)
(3) \( -2 q \)
\( (4)+q \)
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