Section4-2TT - Slide Presentations for ECE 329, Slide...

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Unformatted text preview: Slide Presentations for ECE 329, Slide Presentations for ECE 329, Introduction to Electromagnetic Fields Introduction to Electromagnetic Fields 4.2 Dielectrics 4.2-3 Dielectrics are based upon the property of polarization, which is the phenomenon of the creation of electric dipoles within the material. Electronic polarization : (bound electrons are displaced to form a dipole) E Q- Q d +- +- Dipole moment p = Q d 4.2-4 Orientational polarization : (Already existing dipoles are acted upon by a torque) Ionic polarization : (separation of positive and negative ions in molecules) Direction into the paper.- +- Q E θ θ Q E E d Torque sin QEd θ = Q ∴ = = T d × E p × E 4.2-5 +- +- +- +- +- +- +- +- +- +- +- +- The phenomenon of polarization results in a polarization charge in the material which produces a secondary E .- ρ S0- + + + + + + +------ z = d z = 0 ρ S0 E a e e χ χ = pS pS ρ ρ = pS pS ρ ρ = - + + + +---- z = 0 z = d S E- + + + + + + +------ + + + +---- t E 4.2-6 Polarization Current 4.2-74....
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This note was uploaded on 01/22/2011 for the course ECE 329 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.

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Section4-2TT - Slide Presentations for ECE 329, Slide...

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