A charge \( q \) is placed at the centre of the line joining two equal charges \( Q \). The syst...

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A charge \( q \) is placed at the centre of the line joining two equal charges \( Q \). The system of the three charges will be in equilibrium if \( q \) is equal to
(a) \( -Q / 4 \)
(b) \( Q / 4 \)
(c) \( -Q / 2 \)
(d) Q/2
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