Electromagnetic Forces and Energy
The evaluation of the electromagnetic forces and torques exerted on bodies in motion is of central importance to the power engineer. When the body is in uniform translation the most efficient way of obtaining the forces is normally by use of “frame hopping”. This method, already used extensively in previous chapters, consists of solving the problem in a convenient frame of reference, and subsequently transforming the results back to the frame in which they originally were needed. We have applied the method to a few elementary examples: a simple magnetic levitation system, and a moving mirror. The preferred frame is often the rest frame of the material, and we are there-fore confronted with the problem of evaluating forces and torques on a motionless body. The literature on the subject is abundant. We summarize its main results in the introductory sections of this chapter.
KeywordsTorque Refraction Nite
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