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Two point charges A and B, having charges +Q and –Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :

(1) $F$

(2) $9F\over16$

(3) $16F\over9$

(4) $4F\over3$
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Ans: (2) $9F\over16$

Sol: Case of charge transfer.

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