How Does Inserting a Dielectric Affect Voltage in an Uncharged Capacitor?

In summary, when a dielectric is inserted into a capacitor that is not connected to a battery, the voltage decreases because the net electric field between the conductors is decreased. This is due to the fact that there is less room for particles to lose potential over. The capacitance also increases with a higher dielectric coefficient, resulting in a lower voltage across the capacitor. This is due to the properties of the dielectric and the polarization of particles within it.
  • #1
Gear300
1,213
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For a capacitor not connected to a battery, why does the voltage decrease with the insertion of a dielectric. Would it be because the net electric field between the conductors is decreased?
 
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  • #2
you just answered your own question. there is also less room for particles to lose potential over.
 
  • #3
username2 said:
you just answered your own question. there is also less room for particles to lose potential over.

Gear300, your answer is a lot better than this one. Yes, the dielectric decreases the electric field. What do you mean "less room"?
 
  • #4
alternative method :
Q=CV
V=Q/C

insert a dielectric , keeping the charge accumulated unchanged. the greater the dielectric(coefficient e), the greater the capacitance and the lower the voltage across

but why. it is related to the properties of dielectric ... and polarization makes the V decreases as well as ... that's another story
 
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Related to How Does Inserting a Dielectric Affect Voltage in an Uncharged Capacitor?

What is a capacitor with dielectric?

A capacitor with dielectric is an electronic component that stores electrical energy by using an insulating material called dielectric. It consists of two parallel plates separated by the dielectric material, which helps to increase the capacitance of the capacitor.

What is the purpose of using a dielectric material in a capacitor?

The dielectric material in a capacitor serves to increase the capacitance of the capacitor. It does this by reducing the electric field between the plates, allowing for a larger amount of charge to be stored on the plates.

What are the different types of dielectric materials used in capacitors?

There are several types of dielectric materials used in capacitors, including ceramic, paper, plastic, and electrolytic materials. Each type has its own specific characteristics and is used in different applications based on its dielectric constant, breakdown voltage, and other properties.

What is the dielectric constant of a material and how does it affect a capacitor?

The dielectric constant is a measure of how well a material can store electrical energy. It is a crucial factor in determining the capacitance of a capacitor, as a higher dielectric constant will result in a larger capacitance. This means that the higher the dielectric constant of a material, the more charge it can store on the plates of a capacitor.

Can a capacitor with dielectric store an unlimited amount of charge?

No, a capacitor with dielectric has a maximum capacitance and can only store a finite amount of charge. The amount of charge it can store is determined by the dielectric constant of the material, the size of the plates, and the distance between them. If the electric field becomes too strong, it can cause the dielectric material to break down, resulting in the capacitor failing.

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