The effect of electric fields in a classic introductory physics treatment of eddy current forces

A simple model of eddy currents in which current is computed solely from magnetic forces acting on electrons proves accessible to introductory students and gives a good qualitative account of eddy current forces. However, this model cannot be complete; it ignores the electric fields that drive curre...

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Veröffentlicht in:American journal of physics 2001-05, Vol.69 (5), p.586-590
Hauptverfasser: Salzman, P. J., Burke, John Robert, Lea, Susan M.
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Burke, John Robert
Lea, Susan M.
description A simple model of eddy currents in which current is computed solely from magnetic forces acting on electrons proves accessible to introductory students and gives a good qualitative account of eddy current forces. However, this model cannot be complete; it ignores the electric fields that drive current outside regions of significant magnetic field. In this paper we show how to extend the model to obtain a boundary value problem for current density. Solution of this problem in polar coordinates shows that the electric field significantly affects the quantitative results and presents an exercise suitable for upper division students. We apply elliptic cylindrical coordinates to generalize the result and offer an exercise useful for teaching graduate students how to use nonstandard coordinate systems.
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source 美国小型学会期刊集(AIP Scitation平台)
subjects Electricity
Electrons
Magnetism
Physics
title The effect of electric fields in a classic introductory physics treatment of eddy current forces
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