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In normal ferromagnetic material, the magnetic domains within the material are randomly oriented. When an external magnetic field is applied, it causes the magnetic domains to align more or less in the same direction. During the second half of the AC cycle, when flux is flowing the opposite direction, extra energy is required to flip those domains all the way around to face the other direction. And then, in the first half of the next AC cycle, they have to flip all the way around again. That extra energy is the hysteresis loss.

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16y ago

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