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Two large parallel plates, separated by a distance of 3.0 mm have a capacitance of 10pF and are charged to a potential of 12V

Two large parallel plates, separated by a distance of 3.0 mm have a capacitance of 10pF and are charged to a potential of 12V by a battery. The plates are disconnected of 12V by a battery. The plates are disconnected from the battery and pulled apart to 5.0 mm. The potential difference between the plates is: (a) 12V (b) 20 V (c) zero (d) 7.2 V

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