Dielectrics

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Table of Contents

• Dielectrics
  • Key Definitions
  • Polarization
  • Dielectrics
    • $V=Ed=\frac{E_0}{k}d$
    • $C=\frac{Q}{V}\therefore C=k{C}_0$

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Dielectrics

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Key Definitions

Dielectrics - insulating materials, used between plates of

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Polarization

Insulators in an electric field polarize due to attraction between external charges and the atomic structure of the insulator:

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Dielectrics

Molecules of the insulating material between plates of a capacitor polarize (due to the electric field).

This attracts more charge on the (negative) plate (cathode).

Thus, increasing the capacitance while decreasing electric field strength, which results in smaller voltage between the plates:

$V=Ed=\frac{E_0}{k}d$

Where k is a factor to quantify a dielectric which increases the capacitance of a capacitor:

$C=\frac{Q}{V}\therefore C=k{C}_0$