Understanding the Effects of Dielectrics on Capacitors

In summary, when a dielectric is inserted in a capacitor, the charge remains unchanged because it accumulates on the surface area, which remains the same. However, the potential decreases and the capacitance increases because the dielectric increases the capacitor's ability to hold a charge in an electric field. If there was a power source, the answer may change depending on the specific conditions of the circuit.
  • #1
maiad
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Homework Statement


When a dielectric is inserted in a capacitor, why does the charge remain unchanged while the potential decreases and capacitance increase?

Homework Equations


The Attempt at a Solution


i'm not really about this one, but is it because the charges accumulate on the surface area and since surface area doesn't change after an insertion of a dielectric, the charges won't change since area didn't change? But then again... Capacitance is a capacitors ability to hold a charge in a electric field and it increase so you can see my dilemma lol.
 
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  • #2
O never mind there was no power source ;P but on that note, let's say if there was a power source, how would it change the answer?
 

FAQ: Understanding the Effects of Dielectrics on Capacitors

What is a capacitor with a dielectric?

A capacitor with a dielectric is an electrical component that is used to store and release electrical energy. It consists of two conducting plates separated by an insulating material called a dielectric.

What is the purpose of a dielectric in a capacitor?

The dielectric in a capacitor serves to increase the amount of charge that can be stored on the conducting plates. It also helps to reduce the electric field between the plates, which increases the capacitance of the capacitor.

What are some common materials used as dielectrics in capacitors?

Some common materials used as dielectrics in capacitors include air, paper, plastic, ceramic, and glass. Each material has different properties that affect the performance and capacitance of the capacitor.

How do you calculate the capacitance of a capacitor with a dielectric?

The capacitance of a capacitor with a dielectric can be calculated using the formula C = εA/d, where C is the capacitance, ε is the permittivity of the dielectric, A is the area of the plates, and d is the distance between the plates.

What is the effect of temperature on a capacitor with a dielectric?

The dielectric constant of a material can change with temperature, which can affect the capacitance of the capacitor. In general, the capacitance decreases as the temperature increases due to the increase in thermal energy causing the atoms in the dielectric to vibrate more and decrease their ability to polarize.

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