Created by StemPy LabWhen a charged capacitor is disconnected from its source, the charge on it stays fixed, not the voltage. Energy stored is , so any change in changes , and the lost electrical energy appears as other forms, here as heat from friction.
A parallel plate capacitor of capacitance is charged by a battery to a potential difference and then disconnected from the battery. A dielectric slab of dielectric constant is now slid in, completely filling the gap between the plates. Due to friction between the slab and the plates, the slab eventually comes to rest fully inserted. How much heat is generated in this process?
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