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lecture11 - Dielectric Materials What is a die ctric m rial...

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Dielectric Materials
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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 rotateso they align with the field. This creates an excess of positivecharges on onefaceof thedielectric and a corresponding excess of negativecharges on the other face.
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Dielectric Material Dielectric Material is smaller in many materials than it would bein a vacuum for the same arrangement of charges. Eg. Parallel plates : E σ + σ - E o ο κε σ κ = = 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 , sinceQ=C/V. E i
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Dielectric Constant Dielectric Constant (“kappa”) = “dielectric constant” = (a pure number 1) κ So, d A C ο κε = (for parallel plates) Or 0 C C κ = Where C 0 is the capacitance without the dielectric.
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