Mystery of Capacitance Increase with Dielectric Insertion

In summary, the presence of a dielectric material in between parallel plate capacitors increases the capacitance due to its ability to change the permittivity of the medium. This allows for a stronger electric field to be generated between the plates, resulting in the storage of more energy for the same voltage.
  • #1
cragar
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I thought capacitance was a function of geometry. So how come when we put in a dielectric in between a parallel plate capacitor it increases the capacitance. Is this because we can increase the E field in between without worrying about dielectric breakdown. Or does it have something to do with induced surface charges on the dielectric.
 
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  • #2
cragar said:
I thought capacitance was a function of geometry. So how come when we put in a dielectric in between a parallel plate capacitor it increases the capacitance. Is this because we can increase the E field in between without worrying about dielectric breakdown. Or does it have something to do with induced surface charges on the dielectric.

Capacitance is a function of geometry and also the permittivity of the medium. The dielectric changes the permittivity. A dielectric material's molecules individual electric charge will alter the strength of the electric field between the plates. This means you can push more electrons between the plates for the same voltage if you change the dielectric, because the electric field won't be as strong. You can think of the dielectric as where the actual energy is stored.
 
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  • #3
ok , thanks for your answer.
 

What is capacitance increase with dielectric insertion?

Capacitance increase with dielectric insertion refers to the phenomenon where the capacitance of a capacitor increases when a dielectric material is inserted between the plates of the capacitor.

How does the dielectric material affect capacitance?

The dielectric material affects capacitance by increasing the electric field between the plates of the capacitor, leading to an increase in the amount of charge that can be stored.

What factors influence the amount of capacitance increase?

The amount of capacitance increase with dielectric insertion is influenced by the permittivity of the dielectric material, the distance between the plates, and the area of the plates.

What is the significance of capacitance increase with dielectric insertion?

Capacitance increase with dielectric insertion has practical applications in electronic devices, as it allows for the storage of more charge in a smaller space.

How is capacitance increase with dielectric insertion measured?

Capacitance increase with dielectric insertion can be measured by comparing the capacitance of a capacitor with and without a dielectric material inserted between the plates, using a capacitance meter or by calculating the ratio of the two capacitance values.

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