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A muF capacitor C1 is charged to V0 = 12...

A `muF` capacitor `C_1` is charged to `V_0 = 120 V`. The charging battery is then removed and the capacitor is connected in parallel to an uncharged `+ 4muF` capacitor `C_2`.

(a) what is the potential difference `V` across the combination?
(b) what is the stored energy before and after the switch `S` is closed?

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