Two experiments are carried out with a parallel plate capacitor (a) The capacito

Question

Two experiments are carried out with a parallel plate capacitor (a) The capacitor is charged to a potential difference of 100 V, disconnected from the source, and then a slab of dielectric is inserted between the plates. (b) The capacitor is connected to a battery which maintains a potential difference of 100 V between the capacitor plates and then a slab of dielectric is inserted between the plates. In which experiment is the energy stored by the capacitor greatest? experiment (a) experiment (b) both the same need more information

Explanation / Answer

In Experiment -b.

Option B.

In experiment a) charge remains same on the plates but potential difference decreases and voltage decreases, since Q=CV then C= Q/V then capacitance increases hence adding the capacitance energy U=Q^2/2C decreases.

So IN experiment a) energy decreases.

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