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Which outcome occurs when strong external magnetic fields saturate the ferromagnetic core of an inductor?

A)Inductance decreases non-linearly
B)Equivalent series resistance decreases
C)Self-resonant frequency increases linearly
D)Temperature coefficient of inductance lowers

💡 Explanation

When an inductor's core is saturated with external magnetic fields, the ferromagnetic core's permeability decreases because the magnetic domains are fully aligned, leading to a non-linear drop in inductance. Therefore inductance decreases, rather than the ESL decreasing, frequency increasing, or a tempered temperature relationship, which would require different underlying magnetic behaviour.

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