Physics 1 Problem Solutions 210

Physics 1 Problem Solutions 210 - 206 Chapt 27 Currents and...

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Unformatted text preview: 206 Chapt. 27 Currents and Resistance 11. In the classical Drude model of conduction of electrons in metals, a macroscopic applied electric field vector E in the metal causes electrons to accelerate with acceleration for a mean time τ between collisions with ions, impurities, and defects in the metal. This acceleration imposes a non-random velocity on the electrons which causes net current flow. Collisions effectively cancel the non-random velocity by scattering the electron isotropically. We will call the non-random velocity just the velocity hereafter for brevity. The mean final velocity between collisions is vectora is vectoraτ and the average velocity is . This average velocity is in fact the drift velocity. Given the current density formula , the current density in the metal is . We call the conductivity of the metal. If the conductivity is independent of vector E , the metal is ohmic....
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