When the excitation current I=0mA, is the magnetic induction intensity b obtained at the center of the electromagnet air gap equal to 0? Why is this happening?

When the excitation current I=0mA, is the magnetic induction intensity b obtained at the center of the electromagnet air gap equal to 0? -B is not equal to 0;

This is because ferromagnetic materials have a certain coercivity, and when the excitation current disappears, there is a certain remanence in the iron core, so B≠0.

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