Chapter 18.8

Chapter 18.8 - Dielectric Materials Dipole formation and/or...

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36 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Dielectric Materials Dipole formation and/or orientation along the external electric field in the capacitor causes a charge redistribution so that the surface nearest to the positive capacitor plate is negatively charged and vice versa. The process of dipole formation/alignment in electric field is called polarization and is described by P = Q’/A Dipole formation induces additional charge Q’ on plates: total plate charge Q t = |Q+Q’|. Therefore, C = Q t / V has increased and dielectric constant of the material ε r = C / C vac > 1 + + + + + + + + --------- - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + Q 0 + Q’ -Q 0 -Q’ region of no net charge net negative charge at the surface, -Q’ net negative charge at the surface, Q’ = PA P
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37 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Dielectric Materials In the capacitor surface charge density
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This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

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Chapter 18.8 - Dielectric Materials Dipole formation and/or...

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