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A charge `q` is placed at the centre of the line joining two equal charges `Q and Q`. The system of the three charges will be in equilibrium, if `q` is equal

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

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