APFIVE Relative Permeability of Ferromagnetic Materials
A researcher applies an extremely strong magnetic field to a sample of iron that was initially unmagnetized. As the external field strength increases, what happens to the relative permeability (μr) of the iron?
A
It increases linearly with field strength
B
It initially increases, then decreases toward 1
C
It decreases continuously from its initial value
D
It remains constant regardless of field strength
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