Abstract
Historically, the iron ore magnetite, or lodestone, which is found in various parts of the world, especially in Magnesia, Greece, was known over 2000 years ago to swing around if suspended on a string.
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Not the electron flow, but the mathematical current from + to −.
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A device for changing the direction of the current through the coil every half turn. Without it, the coil would simply move half a turn and then stop!
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As we have repeatedly said, the (+)s are generally not free to move, so it’s the electrons that do the actual moving. We have only drawn it this way for ease of application of the Lorentz force.
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Note that anything changing its speed and/or direction is indeed accelerating. For motion in a circle, one feels such acceleration in any merry-go-round. Instead of flying off in a straight line we are continually being forced towards the center. Actually, if we were electrically charged we would emit electromagnetic radiation!
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Information from Central Hudson Gas & Electricity, Poughkeepsie, NY.
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© 2015 Springer International Publishing Switzerland
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Nightingale, D., Spencer, C. (2015). Magnetism. In: A Kitchen Course in Electricity and Magnetism. Springer, Cham. https://doi.org/10.1007/978-3-319-05305-9_3
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DOI: https://doi.org/10.1007/978-3-319-05305-9_3
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