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 \( Q \)
\( P \) is equal to :
A) \( \frac{-q}{1+\sqrt{2}} \)
\( \left(\mathrm{B}^{*}\right) \frac{-2 \mathrm{q}}{2+\sqrt{2}} \)
(C) \( -2 q \)
(D) \( +q \)
W.
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