Three charges \( Q,+q \) and \( +q \) are placed at the vertices of an equilateral triangle of s....

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Three charges \( Q,+q \) and \( +q \) are placed at the vertices of an equilateral triangle of side \( l \) as shown
\( \mathrm{P} \)
in the figure. If the net electrostatic energy of the system is zero, then \( Q \) is equal to
(A) \( \left(-\frac{q}{2}\right) \)
(B) \( (-q) \)
(C) \( (+q) \)
(D) Zero


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