Question

effect of dielectric on parallel plate capacitor ​

Answer 1

Answer:

Effect of Dielectric on Capacitance - Study Material for IIT JEE ... Adding dielectric to a capacitor increases the capacitance by a factor of K and, Charge on the capacitor will increase when the voltage is held constant and. If the capacitor is disconnected thatis the charge is held constant the potential across the capacitor will decrease.

Answer 2

Answer:

Explanation:

We usually place dielectrics between the two plates of parallel plate capacitors. They can fully or partially occupy the region between the plates. When we place the dielectric between the two plates of a parallel plate capacitor, the electric field polarises it.

The surface charge densities are σp and – σp. When we place the dielectric fully between the two plates of a capacitor, then it’s dielectric constant increases from its vacuum value.Effect of Dielectric on CapacitanceThe electric field inside a capacitor is as follows:

Hence we have:

Therefore:

Ɛ is the permittivity of the substance. The potential difference between the plates is given by

For linear dielectrics:

Where k is a dielectric constant of the substance, K = 1.

How does the dielectric increase the capacitance of a capacitor?

The electric field between the plates of parallel plate capacitor is directly proportional to capacitance C of the capacitor. The strength of the electric field is reduced due to the presence of dielectric. If the total charge on the plates is kept constant, then the potential difference is reduced across the capacitor plates. In this way, dielectric increases the capacitance of the capacitor.

Effect of Dielectric on Capacitance