Methods of Calculating Forces on Rigid Magnetic Media

Details Methods of Calculating Forces on Rigid Magnetic Media Methods of Calculating Forces on Rigid Magnetic Media

2003-12-03

arxiv.org/abs/physics/0312027v1

Physics

Classical Physics

7 pages, no figures

Scientific paper

Despite 180 years of theory on magnetism, it appears that the practice of calculating forces on magnetic media is ambiguous, as illustrated by a recent article by Casperson. Potentially troubling issues include: Which field B or H should be used? Should the total field be used, or only the external field? And if the latter, what is meant by "external"? Can/should effects of magnetization currents and/or fictitious magnetic poles be included? What is the force on only a portion of a circuit? We review several well-known approaches to magnetic force calculations on elements of rigid circuits, and find it very helpful to use an explicit example to compare and contrast the various methods.

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