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Unformatted text preview: p,, hence J,= JX, so that J' -n da -i. (2.1.26) The minus sign results because the normal vector n is directed outward from the surface. The total charge q on the upper equipotential body in Fig. 2.1.6 is q = vp dV, (2.1.27) where V is a volume that includes the body and is enclosed by the surface S. Use of the conservation of charge (1.1.26) with (2.1.26) and (2.1.27) yields the terminal current dq S- dq (2.1.28) dt Equation 2.1.28 simply expresses the fact that a current i leads to an accumulation of charge on the body. For a quasi-static system in which we impose voltage constraints the field quantities and the charge density p, are determined by (1.1.24), (1.1.25) and (1.1.13), and all are functions of the 2.1.2 Circuit Theory A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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- Fall '11