lecture11 - Dielectric Materials What is a dielectric...

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Unformatted text preview: Dielectric Materials What is a dielectric material? E Dielectric materials consist of polar molecules which are normally randomly oriented in the solid. They are not conductors. When a dielectric material is placed in an external electric field, the polar molecules rotate so they align with the field. This creates an excess of positive charges on one face of the dielectric and a corresponding excess of negative charges on the other face. Dielectric Material Dielectric Material is smaller in many materials than it would be in a vacuum for the same arrangement of charges. Eg. Parallel plates : E + - E o = = o E E + + + + Dielectric material This makes the potential difference smaller (V=Ed) between the parallel plates of the capacitor for the same charges on the plates and thus capacitance is larger , since Q=C/V. E i Dielectric Constant Dielectric Constant (kappa) = dielectric constant = (a pure number 1) So, d A C = (for parallel plates)...
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lecture11 - Dielectric Materials What is a dielectric...

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