Unformatted text preview: where 1o is the perme-ability of free space ou, = 47r x 10- 7 H/m, (1.1.7) in which case it follows from (1.1.4) that the constitutive law of (1.1.6) can also be written as B = uH. (1.1.8) We shall make considerable use of this simple linear model for magnetizable materials. Free currents in a stationary material most often arise from conduction induced by the electric field according to Ohm's law: Jf = oE, (1.1.9) where a is the conductivity (mhos/m). A similar constitutive law relates the surface current density K, to the electric field intensity E, tangential to the surface K, = rsEt, (1.1.10) where ar is the surface conductivity (mhos). These constitutive laws for the Table 1.1 Symbol H Jf K, B M E D Pf af P F Eo0 A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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- Fall '11
- Magnetic Field, Jf K, density Magnetization density, density Polarization density, density Free surface