Find the potential difference between the points A and B between the points B and C of figure in steady state.


Capacitors in parallel:


If capacitors C1, C2, C3 , … are in parallel, then the equivalent capacitance is given by:



Capacitors in series:


If capacitors C1, C2, C3 , … are in sereis, then the equivalent capacitance is given by:



Note that the charge is same on each capacitor in series in steady-state.


The circuit can be redrawn as follows:



We can see that C1 and C2 are in parallel,



Also, we can see that C3 and C24 are in parallel,



The circuit can be redrawn as follows:



Now, the two capacitors and are in series.




Note that there is no current in equilibrium. Hence,



As and are in series,





Now,





Also,





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