1. A capacitor is placed across a battery and allowed to charge completely. The

Question

1.    A capacitor is placed across a battery and allowed to charge completely. The battery is then disconnected and the plates of the capacitor are then moved apart (d increases). State what happened to each of the quantities below (increases, decreases, or stays the same) as the plates were pulled apart.

          Capacitance, C

          Voltage across the capacitor, Vc

          Charge on the plates, Q

          Energy stored in the capacitor, U

9. Same question as #8, except the battery remains connected to the capacitor as the plates are moved apart.

Capacitance, C

          Voltage across the capacitor, Vc

          Charge on the plates, Q

          Energy stored in the capacitor, U

Explanation / Answer

a)Capacitance, C ========== decreases Voltage across the capacitor, Vc ========== increases Charge on the plates, Q ========== same Energy stored in the capacitor, U =======increase b)Capacitance, C ========== decreases Voltage across the capacitor, Vc ========== same Charge on the plates, Q ========== decrease Energy stored in the capacitor, U =======decrease

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