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# A capacitor of capacitance c is charged to a potential difference v from a cell and then disconnected. A charge +q is given to its positive plate .the potential difference across the capacitor is now?

Eshan
3 years ago
Dear student,

After getting charged from the cell, the positive plate attainscharge and the negative plate attains. Whencharge has been supplied to the positive plate, the electric field between the two plate increases.

The contribution to electric field due to this extra charge is . So the field between the plates now becomes
Hence the potential drop between the plates is