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A parallel-plate capacitor with circular plates and a capacitance of 13.9F is connected to a battery which gives a voltage of 12.8V. What is the charge on each plate? How much charge would be on the plates if their separation were doubled while the capacitor remained connected to the battery? How much charge would be on the plates if the capacitor were connected to the battery after the radius of each plate was doubled without changing their separation?

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