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Updated: May 20, 2025
Put any current in it, and it feeds back to increase the magnetism until it reaches saturation. Then it starts to lose its magnetism and that feeds back a counter-emf which increases the demagnetizing current until it's saturated with opposite polarity. You get an alternating magnet, which doesn't evolve heat because of its magnetic instability, but absorbs heat trying to maintain its stability.
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