If the two objects, which are the same in magnetic and volume, are magnetized in different external magnetic fields, and the object is magnetized in a strong magnetic field, and the object is magnetized in a weak magnetic field, then the magnetization of the object is large, B The magnetization of the object is small. Can it be said that the magnetic properties of the armor are stronger than those of the B? If they are magnetized in the same external magnetic field, their magnetization is the same. Therefore, the magnetization of an object is related to the strength of the external magnetic field. Experiments have shown that before the magnetic saturation is reached, the magnetization of the object changes in proportion to the external magnetic field, that is:
J = K 0 H
Where J is the magnetization of the object, ampere/meter;
H—— external magnetic field strength, ampere/meter;
K. - The proportional coefficient, called the volume susceptibility, is dimensionless.
   It can be seen from the above formula that the volume susceptibility K 0 is the ratio of the magnetization of the mineral particles to the strength of the external magnetic field and is an important magnetic index of the mineral. The physical meaning is that the mineral particles per unit volume are magnetized in the unit magnetic field strength. The resulting magnetic moment. Obviously, K indicates the size of the object is magnetized 0 ease, K larger value 0, indicating that the more easily magnetized. For the reverse magnetic ore particles K 0 < 0 , for the paramagnetic ore particles K 0 > O.
However, since the structure of the object is often uneven, there are often voids in the interior, so that when two objects of the same nature (same chemical composition) are magnetized in the same external magnetic field, they may have different magnetizations and different K. Value, which is primarily the result of the effect of voids within the volume of the object. The more voids, the less the number of oriented magnetic moments. Of course, in addition to the voids, there are Other factors that affect the magnetization of the object, and it has not been studied enough. For this purpose, it is necessary to use a magnetization coefficient per unit mass, that is, a specific magnetic susceptibility x of the object. To illustrate the magnetic properties of the object. which is
It should be noted that X 0 and K 0 are important magnetic constants closely related to the nature of the ore. For most objects, such as weak magnetic objects x . And K. It is a constant, and only a few objects, such as X 0 and K 0 of ferromagnetic minerals, are not constant.
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