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An isolated parallel plate capacitor contains charge Q = +10 ?C on its plates, corresponding to a potential difference of 10 V. The initial separation between the plates is d. Later, the distance between the plates is increased by a factor of two while the charge on each plate remains unchanged. What is the capacitance after the separation becomes 2d? A. C B. 2C C. 4C D. C/2 E. C/4

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