Notes18 2317 - Dielectrics ECE 2317 Applied Electricity and Magnetism Under microscope H Fall 2006 water Prof Filippo Capolino ECE Dept H2O = 0 r O

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Prof. Filippo Capolino ECE Dept. Fall 2006 Notes 18 ECE 2317 ECE 2317 Applied Electricity and Magnetism Applied Electricity and Magnetism Notes prepared by the EM group, University of Houston . (used by Dr. Jackson, spring 2006) Dielectrics Dielectrics water 0 r ε εε = Under microscope: + - + H 2 O “dipole” model: p qd p p = = ± A H + O - H + “dipole moment”: d ± A +q -q + - Dielectrics (cont.) Dielectrics (cont.) + - V x + + + + - - - - E x + - + - + - + - + - Define: P = total dipole moment/volume 1 i V P p V Δ Δ 0 D EP ≡+ Define the electric flux density vector D : V Δ Dielectrics (cont.) Dielectrics (cont.)
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Linear Material: () 0 00 0 1 1 e e e re PE DE E E εχ ε = =+ ≡+ Define: 0 r εε = = Then: Note: χ e > 0 for most materials Dielectrics (cont.) Dielectrics (cont.) χ e is called the “electric susceptibility” Typical Linear Materials Typical Linear Materials Teflon Water Styrofoam Quartz 2.2 81 1.03 5 r r r r = = = = Dielectrics: Bound Charge Dielectrics: Bound Charge 0 vb ρ < Assume that E x increases as x increases: A net volume charge density is created inside the material, called the “bound charge density” or “polarization charge density”. ρ vb = “bound charge density”: due to molecules, it is not free to move ρ v = “free charge density”: due to charge you place inside the material: it is free to move, in general
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This note was uploaded on 10/25/2011 for the course ECE 2317 taught by Professor Staff during the Fall '08 term at University of Houston.

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Notes18 2317 - Dielectrics ECE 2317 Applied Electricity and Magnetism Under microscope H Fall 2006 water Prof Filippo Capolino ECE Dept H2O = 0 r O

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