A parallel plate capacitor of capacitance
with a dielectric slab in between its plates is connected to a battery. It has a potential difference
across its plates. When the dielectric slab is removed, keeping the capacitor connected to the battery, the new capacitance and potential difference are
and
respectively. Then,
Text Solution
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The capacitor is kept connected to the battery throughout the process. A battery maintains a constant potential difference across its terminals.

The capacitance of a parallel plate capacitor with a dielectric is

.
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