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Redistribution of charges and concept of common potential

Question

A 60 pF capacitor is fully charged by a 20 V supply. It is then disconnected from the supply and is connected to another uncharged 60 pF capacitor in parallel. The electrostatic energy that is lost in the process by the time the charge is redistributed between them is (in nJ) ____

Moderate
Solution

V0=20V

Heat loss =      U1Uf          =12CV02212CV022  =CV024

=60×10122024J               =6×109J=6nJ



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A 600 pF capacitor is charged by a 200 V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. What is the common potential (in V) and energy lost (in J) after reconnection?


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