A charge \( Q \) is placed at the centre of the line joining two point charges \( +q \) and \( +...

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A charge \( Q \) is placed at the centre of the line joining
two point charges \( +q \) and \( +q \) as shown in figure.
The ratio of charges \( Q \) and \( q \) is
(a) 4
(b) \( 1 / 4 \)
(c) \( -4 \)
(d) \( -1 / 4 \)
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