Hc, also known as Hcb or bHc, Coercive force: is equal to the demagnetizing force required to reduce induction field, B,
to zero after the magnet has previously been saturation magnetized, measured in Oersteds (Oe) or Amperes per meter (A/m).
In this case, the magnet’s magnetization strength is not zero. If the external magnetic field is revoked at this moment,
the magnet can still show some magnetism.


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