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  1. AP Physics C E M
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Define 'dielectric'.

Insulating material that increases capacitance when inserted into a capacitor, allowing more charge to be stored at the same voltage.

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Define 'dielectric'.

Insulating material that increases capacitance when inserted into a capacitor, allowing more charge to be stored at the same voltage.

What is the dielectric constant (k)?

A value representing how much a material can be polarized; indicates how much the material boosts capacitance.

Define 'polarization' in the context of dielectrics.

The alignment of molecules within a dielectric material in response to an electric field, creating a layer of opposite charge on the surface.

What is C0C_0C0​?

Capacitance without a dielectric.

What is the dielectric constant of a vacuum?

1

What does a high dielectric constant indicate?

The material is easily polarized.

Compare the electric field with and without a dielectric.

Without a dielectric, the electric field is stronger. With a dielectric, the induced electric field reduces the overall electric field strength.

Compare the capacitance with and without a dielectric.

Without a dielectric, the capacitance is lower (C0C_0C0​). With a dielectric, the capacitance is higher (C=kC0C = kC_0C=kC0​).

Compare the dielectric constant of air and water.

Air has a dielectric constant close to 1 (1.00059). Water has a much higher dielectric constant of 80.

Compare the effect on capacitance of materials with high k vs low k

Materials with high k increase capacitance more than those with low k.

Compare a conductor and a dielectric.

A conductor allows free flow of electrons. A dielectric is an insulator that can be polarized.

Compare the electric field with and without a dielectric.

Without: Stronger electric field. | With: Weaker electric field due to polarization.

Compare capacitance with and without a dielectric.

Without: Lower capacitance. | With: Higher capacitance due to the dielectric constant.

Compare the voltage with and without a dielectric.

Without: higher voltage. | With: lower voltage.