A charge q is placed at the centre of the line joining two equal charges Q. The system of the thr...

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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
(1987,2 M)
(a) -Q/2
(b) -Q/4
(c) +Q/4
(d)+Q/2

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How considered Q is positive charge, not given in question.

maheshr