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

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Three charges \( Q,(+q) \) and \( (+q) \) are placed at the vertices of an equilateral triangle of side \( l \) as shown 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) \( (+q) \)
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