Rules for Combination of Capacitors (Physics-Lesson-15. 10) Part 2

Physics 1 minute read

Example 15.4:

Two capacitors of 20v_battery capacitance are connected in parallel. What would be the equivalent capacity? If a 20V battery is connected across the combination, (fig. 15.18) find out

  1. The voltage across the two capacitors.
  2. The quantity of charge on each capacitor. 

connected-across-the-combination

Fig. 15.18 

Solution:

charge on each capacitor

If Ce is the equivalent capacitance of this parallel combination, then

parallel combination

  1. As the two capacitors are connected in parallel, the voltage drop across each capacitor would be the same, equal to voltage of the battery i.e, 20 volts.
  2. Let the charge on the capacitor of capacitance capacitance
capacitance_equation

Let the charge on the capacitor of capacitance   capacitor of capacitance

let the charge

Example 15.5: capacitors of capacitorscapacitance are connected in series. Find the equivalent capacitance (fig. 15.19).

Find the-equivalent-capacitance

Fig. 15. 19

Solution:

capacitor_eaquation

If Ce is the equivalent capacitance of the series combination, it is given by

equivalent capacitance