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Two experiments are carried out with a parallel plate capacitor (a) The capacitor is charged to...

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?

a) experiment (a)
b) experiment (b)
c) both the same
d) need more information

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