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The B–H curve of a ferromagnetic material represents the relationship between magnetic flux density (B) and magnetic field strength (H) when the material is subjected to a magnetizing field. Starting from an unmagnetized state, as the magnetic field strength is increased, the flux density increases rapidly at first due to the alignment of magnetic domains. This initial portion of the curve is nonlinear, showing that a small increase in H produces ________ _________ ________ ______ ________ _________ _______ __________ _________.
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