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Electrical Engineering: Know It All by Dan Bensky, Walt Kester, Tim Williams, John Bird, Clive Maxfield

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Chapter 21

Magnetic Fields

Ron Schmitt

Magnetic fields are inherently different and more difficult to grasp than electric fields. Whereas electric fields emanate directly from individual charges, magnetic fields arise in a subtle manner because there are no magnetic charges. Moreover, because there are no magnetic charges, magnetic field lines can never have a beginning or an end. Magnetic field lines always form closed loops. You may have heard that some particle physicists have been searching for magnetic charges (or “magnetic monopoles,” as the particle physicists call them) in high-energy experiments. In fact, many unified theories of physics require such particles. However, at this point such particles have not been found. Even if they were ...

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