Why is the permeability of ferromagnetic material independent of the magnetic field?
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Hence, a toroid with a bismuth core has a magnetic field slightly greater than a toroid whose core is empty. (d)The permeability of ferromagnetic materials is not independent of the applied magnetic field. Hence, magnetic field lines are always nearly normal to the surface of such materials at every point.
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The permeability of ferromagnetic materials is inversely dependent on the applied magnetic field, i.e. it is lower for a higher field and vice versa.
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