# Problem Three (5 points) To charge a capacitor, I have to move the electron the wrong...

###### Question: Problem Three (5 points) To charge a capacitor, I have to move the electron the wrong way, from the (+) plate to the (-) plate. That is going to take some work. Consider what it takes for a very large parallel plate capacitor with capacitance C. a. (4 points) Derive how much total energy does it take to charge it up Q. For full credit, make the principles and conceptual steps clear with words and maybe an appropriate sketch b. If disconnect this capacitor from the battery used to charge it to Q, and move the plates further away from each other, how does the energy change ? Explain.

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