First slide
Redistribution of charges and concept of common potential
Question

In the adjoining figure, four capacitors are shown with their respective capacities and the P.D. applied. The charge and the P.D. across the 4μF  capacitor will be.

Moderate
Solution

Total capacitance  1C=120+18+112C=12031μF
Total charge  Q=CV=12031×300=1161μC
Charge, through 4μF condenser  =11612=580μC
and potential difference across it  =5804=145V.
 

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