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

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Slide Presentations for ECE 329, Slide Presentations for ECE 329, Introduction to Electromagnetic Fields Introduction to Electromagnetic Fields
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4.2 Dielectrics
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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
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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
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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 0 e e χ χ = 0 pS pS ρ ρ = 0 pS pS ρ ρ = - + + + + - - - - z = 0 z = d S E - + + + + + + + - - - - - - + + + + - - - - t E
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4.2-6 Polarization Current
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4.2-7 To take into account the effect of polarization, we define the displacement flux density vector, D , as
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