A parallel-plate capacitor is charged by a 17.0 V battery, thenthe battery is removed. What is the

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A parallel-plate capacitor is charged by a 17.0 V battery, thenthe battery is removed. What is the potential difference betweenthe plates after the battery is disconnected? What is the potentialdifference between the plates after a sheet of Teflon is insertedbetween them?