A capacitor of capacitance \( C \) is charged to a potential difference \( V \) from a cell and ...

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A capacitor of capacitance \( C \) is charged to a potential difference \( V \) from a cell and then disconnected from it. A charge \( +Q \) is now given to its positive plate. The potential difference across the capacitor is now
 
(a) \( V \)
(b) \( V+\frac{Q}{C} \)
(c) \( V+\frac{Q}{2 C} \)
(d) \( V-\frac{Q}{C} \), if Q < CV
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