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A capacitor having a capacitance of 20...

A capacitor having a capacitance of 200 `mu F` is charged to a potential difference of 20V. The charging battery is disconnected and the capacitor is connected to another battery of emf 10V with the positive plate of the capacitor joined with the positive terminal of the battery.
(a) Find the charges on the capacitor before and after the reconnection in steady state.
(b) Find the net charge flown through the 10 V battery
Is work done by the battery or is it done on the battery? Find its magnitude.
(d) Find the decrease in electrostatic field energy.
(e) Find the heat developed during the flow of charge after reconnection .

Text Solution

Verified by Experts

The correct Answer is:
(a) `4000mu C, 2000mu C " " (b) 2000mu C " " ` (c) work is done on the battery , 20 mJ
(d) 30 mJ (e) 10 mJ
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Knowledge Check

  • An ideal capacitor of capacitance 0.2muF is charged to a potential difference of 10V . The charging battery is than disconnected. The capacitor is then connected to an ideal inductor of self inductance 0.5mH . The current at a time when the potential difference across the capacitor is 5V is :

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