1

Question

A 600pF capacitor is charged by a 200V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. How much electrostatic energy is lost in the process?

Open in App

Solution

Given: The capacitance of the capacitor is

The electrostatic energy stored in the capacitor is given as,

where, the electrostatic energy stored in the capacitor is

By substituting the given values in the above equation, we get,

If supply is disconnected from the capacitor and connected to another capacitor, then capacitors are in series.

Total capacitance of the combination of capacitors when connected in series is given as,

where, total capacitance is

By substituting the given values in the above equation, we get,

Total capacitance of the combination when connected in series is

New electrostatic energy stored in the capacitor is given as,

where, the electrostatic energy stored in the capacitor is

By substituting the given values in the above equation, we get,

Loss of electrostatic energy

Therefore, the loss of electrostatic energy in the process is

13

Join BYJU'S Learning Program

Join BYJU'S Learning Program