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5 A parallel-plate capacitor (Homework #2) A parallel-plate capacitor is made by a pair of plates with area A and separation d. At first, the plates are charged up to+ and - respectively, and then a battery is disconnected. Express all the answers for a) through f only by Q, d, A and s 2d Area ANow the places are pulled apart until the separation becomes 2d What is the electric field Einside of the capacitor? (Express E by E g) What is the potential difference between the plates? (Express by V) h) What is the capacitance C (Express C by C) i What is the energy U stored in the capacitor? (Express U by U) How much work is done? (Express W by U.)

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eo A dl A 2 A2 C

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