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You have a parallel-plate 6.71 F capacitor that is charged to 8.51 mC. While the capacitor is isolated, you change the plate separation so

You have a parallel-plate 6.71 F capacitor that is charged to 8.51 mC. While the capacitor is isolated, you change the plate separation so that the capacitance becomes 2.79 F. How much work W do you perform in this process? W = J

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