(1) The value of the specific magnetization coefficient of magnetite is not constant, it varies with the magnetic field strength of the external magnetic field, and is easily magnetized in the magnetic field.

(2) When the magnetic field is low, the magnetization of the magnetite can reach magnetic saturation. That is to say, the magnetic field strength of the external magnetic field is further increased, and the magnetization or magnetic induction of the magnetite is not increased.

(3) After the magnetite leaves the magnetic field, the mineral cannot recover to the state before entering the magnetic field, while retaining a certain magnetic property. This phenomenon is called remanence. To remove the remanence, you need to apply a reverse magnetic field to it. The magnetic field strength that causes the residual magnetism to completely remove the added reverse magnetic field is called coercive force.

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