Compute all parts of given problemproblem a parallel-plate, Ask an Expert

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Compute all parts of given problem:

Problem: A parallel-plate capacitor with plate area 4.0cm^2 and air-gap separation 0.50 mm is connected to a 9.0-V battery, and fully charged. The battery is then disconnected.

Part A: What is the charge on the capacitor?

Part B: The plates are now pulled to a separation of 0.75 mm. What is the charge on the capacitor now?

Part D: What is the potential difference between the plates now?

Part E: How much work was required to pull the plates to their new separation?

Any help I can get on this problem is greatly appreciated! I'm not too familiar with this problem.

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