_____Electromagnetic TheoryWith our basic unified approach it is often difficult to distinguish betweenthose aspects of electromechanics that may be considered research in thescientific sense and those that represent engineering applications. Forexample,there are many practical uses for a magnetohydrodynamic flow meter, yet thetype of theoretical model needed in its study is also pertinent to an under-standing of the origin of the earth's magnetic field as it is generated by motionof the molten interior of the earth. In fact, a study of magnetohydrodynamicsinvolves models that are germane to an engineering problem such as thelevitation of a molten metal, an applied physics problem such as plasmaconfinement, or a problem of astrophysical interest such as the dynamics ofstellar structures.The subject of electromechanical dynamics, as we approach it in thefollowing chapters, provides a foundation for a range of interests that extendsfrom the purely scientific to engineering applications
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