Electromechanical Dynamics (Part 1).0030

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Electromagnetic Theory ideal circuit consisting of equipotentials separated by perfect insulators with resistances connected externally between terminals to account for the finite conductivity of the dielectric. In this book the constituent relation for the conduction process usually takes the form of (1.1.9) or (1.1.10). In electric field systems, however, there can be appreciable net charge density, and we must be careful to distinguish between a netflow of charge, which occurs in electrically neutral conductors such as metals, and aflow ofnet charge, which occurs in situations such as the drift of negative charge in a vacuum tube. To allow for this differentiation when it is needed a more general form of the conduction constituent relation is used: J, = (p,p++ + p,-u-_)E, (1.1.16) where pf+ and p,- are the densities of the two species of moving charges and p+ and I- are the respective mobilities in the field intensity E. When the charge densities and mobilities are constants, (1.1.16) reduces to (1.1.9).
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This note was uploaded on 02/10/2012 for the course MECE 4371 taught by Professor Liu during the Fall '11 term at University of Houston.

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