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This is my first post on the forum, but I have used the site many times for previous help. My professor started us on capacitors today and just had time to give us a bunch of equations without much explanation of how to solve problems. A problem he gave us to solve so as so:

A 20.0 microFarad capacitor is charged to a potential difference of 900V. the terminals of the charged capacitor are then connected to those of an uncharged 10.0 microFarad capacitor. Find:

a) The original charge of the system.

b) The final potential difference across each capacitor.

c) The final energy of the system.

d) The decrease in energy when the capacitors are connected.

e) Where did the "lost" energy go?

I think i managed a) Q=CV so (20uF)(900V)=18000uC

But that's all I have so far. If anyone could possible help me by setting me off in the right direction with any suggestions it would be greatly appreciated.

Thanks so much

Spudvr