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MHT CET 2021 (22 Sep, Shift 1) · Dielectrics

Dielectrics question from MHT CET 2021 (22 Sep, Shift 1)

Q73MHT CET 2021 · 22 SEP · SHIFT 1Easy

Dielectrics

When the battery across the plates of a charged condenser is disconnected and a dielectric slab is introduced between its plates then the energy stored

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Answer: (d)

Battery disconnected: $Q$ is constant.
$U = \frac{Q^2}{2C}$ ; slab makes $C' = KC$ , so $U' = \frac{U}{K} < U$ .
So the energy decreases: answer (d).

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