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fields_lec5 - Key Concepts for this section 1 Lorentz force...

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1: Lorentz force law, Field, Maxwell’s equation 2: Ion Transport, Nernst-Planck equation 3: (Quasi)electrostatics, potential function, 4: Laplace’s equation, Uniqueness 5: Debye layer, electroneutrality Goals of Part II: (1) Understand when and why electromagnetic (E and B) interaction is relevant (or not relevant) in biological systems. (2) Be able to analyze quasistatic electric fields in 2D and 3D. Key Concepts for this section
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EM interactions in media - polarization (linear medium) 0 ext E = G - + - + - + - + - + - + - + - + - + - + - + - + ext E G - + - + - + ext E G pol E G 1 pol ext media ext pol ext r E E E E E E ε = = G G G G G G ε r : relative permittivity (dielectric constant ) of the medium (=>1)
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ε of various media Medium ε r Water (pure) ~80 0.9% NaCl solution ~60 Ethanol 24 Methanol 34 Acetic acid 15~16 Gases ~1 Glass 3~4 Plastics and rubbers 2~9
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