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Unformatted text preview: • The capacitance of a capacitor increases by a factor κ when a piece of insulating ( dielectric ) material is inserted between the plates. – Where C is the capacitance before the dielectric is inserted, and is the dielectric constant of the material – This increase is due to induced surface charge on the dielectric. • For a parallel plate capacitor with dielectric: • Energy is stored in a capacitor when charged. – The stored energy is equal to the amount of work done by the battery in transfer charge from one plate to the other. – For a capacitor with charge magnitude q and potential difference V between the plates C C = d A C κε = d A (area) dielectric C q CV qV Energy 2 2 1 2 1 2 2 = = =...
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