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  3. Physics
  4. A capacitor is fully charged with a battery and then disconnected. A dielectric is then inserted into the capacitor. How do charges on surface of the dielectric and outer surface of the plates of the capacitor would change respectively?

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Q. A capacitor is fully charged with a battery and then disconnected. A dielectric is then inserted into the capacitor. How do charges on surface of the dielectric and outer surface of the plates of the capacitor would change respectively?

TS EAMCET 2020

Solution:

As capacitor is disconnected from battery. Its charges at the plates will get stored in the form of electrostatic energy (Case I).
image
When a dielectric is introduced inside this capacitor, it gets polarised as shown in (Case II).
Due to this, charges at surface of dielectric gets increased.
Since, there is no external electric supply of power source.
Hence, charges on capacitor remains unchanged.