Question
Thu May 24, 2012

# in series combinations of capacitors , why the sum of charges is equal to the total charge ?

Fri May 25, 2012
 Since charge cannot be added or taken away from the conductor between series capacitors, the net charge there remains zero. As can be seen from the diagram, that constrains the charge on the two capacitors to be the same in a DC situation. This charge Q is the charge you get by calculating the equivalent capacitance of the series combination and multiplying it by the applied voltage V. You store less charge on series capacitors than you would on either one of them alone with the same voltage!

Does it ever make sense to put capacitors in series? You get less capacitance and less charge storage than with either alone. It is sometimes done in electronics practice because capacitors have maximum working voltages, and with two "600 volt maximum" capacitors in series, you can increase the working voltage to 1200 volts.

Related Questions
Tue July 25, 2017

# A parallel plate capacitor of capacitance 20 micro Farad is connected to a 100 volt supply. After sometime the battery is disconnected and space between the plates of the capacitor is filled with dielectric of dielectric constant 5. Calculate the energy stored in the capacitor a) before b)after the dielectric has been put in between its plates

Tue July 25, 2017

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