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A parallel plate air capacitor with a capacitance of 2.5 nF is connected to a 6.5 V battery and charged. The capacitor is then disconnected

A parallel plate air capacitor with a capacitance of 2.5 nF is connected to a 6.5 V battery and charged. The capacitor is then disconnected from the battery and a dielectric with a dielectric constant of k = 4.0 is inserted between the plates. How much energy will be stored in the capacitor after inserting the dielectric (6 points)?

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