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在研究电和磁的现象的時候,很容易注意到:電场中電介体的行為与磁埸中磁体的行為之間有若干相似的地方。在这兩种情形中都可以观察到場和引入場中的物体间的相互作用:在电场中是电介体的電極化,在磁場中是磁体的磁化,这种电極化和磁化又引起了埸的本身的改变。我們知道,在磁的性质上物体可為分三类:順磁体、抗磁体和鉄磁体。第一類物质為順磁体,当它被引入磁场中時,其磁化方向与磁場方向相同,而且在磁化强度与磁場强度间可观察到直線性的比例關係,只有在磁场强度很大時这關係才被破壞。第二类物質為抗磁体,被引入磁场中時,其磁化方向与磁場方向相反。第三类物質為铁磁体,為數比較不多,
When studying the phenomena of electricity and magnetism, it is easy to notice that there are some similarities between the behavior of a dielectric in an electric field and the behavior of a magnet in a magnet. In either case, the interaction between the field and the object introduced into the field can be observed: the electrical polarization of the dielectric in the electric field and the magnetization of the magnet in the magnetic field, which in turn causes The change of 埸 itself. We know that the object in the nature of magnetism can be divided into three categories: paramagnetic, anti-magnet and 鉄 magnet. The first type of material is paramagnetic. When it is introduced into a magnetic field, the direction of magnetization is the same as the direction of the magnetic field, and a linear relationship between the magnetization and the magnetic field strength can be observed. Only when the magnetic field strength is large Was destroyed. The second type of material is anti-magnet, when introduced into the magnetic field, its magnetization direction and the magnetic field in the opposite direction. The third category of material for the ferromagnetic, the number is relatively small,