lecture11 - Dielectric Materials Whatisadielectricmaterial?

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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 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.
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Dielectric Material      is smaller in many materials than it would be in a vacuum for the  same arrangement of charges. Eg.    Parallel plates : E σ + - E o ο κε 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 -E i
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This note was uploaded on 10/14/2011 for the course ENGINEER CHEM ENG 3 taught by Professor Ghosh during the Spring '11 term at McMaster University.

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lecture11 - Dielectric Materials Whatisadielectricmaterial?

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