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Two capacitors, one that has a capacitance of 7 µF and one that has a capacitance...

Two capacitors, one that has a capacitance of 7 µF and one that has a capacitance of 21 µF are first discharged and then are connected in series. The series combination is then connected across the terminals of a 10-V battery. Next, they are carefully disconnected so that they are not discharged and they are then reconnected to each other--positive plate to positive plate and negative plate to negative plate.

(a) Find the potential difference across each capacitor after they are reconnected.
_____ V (7 µF capacitor)
_____ V (21 µF capacitor)

(b) Find the energy stored in the capacitor before they are disconnected from the battery, and find the energy stored after they are reconnected
_____ µJ (before disconnected)
_____ µJ (reconnected)

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