Neodymium magnets, also called neodymium bar magnets, are tetragonal crystals composed of neodymium, iron, and boron. Since classical physics still refuses to use the concept of elementary particles to study the problem of magnetic fields, they define the cause of the magnetic field as the directional movement of point charges and interpret the cause magnets as magnetic domains in electromagnetism and electrodynamics.
Modern physics proves that the ultimate structure of any matter is electrons, protons (with positive unit charge), and neutrons (showing electric neutrality to the outside). A point charge is a point of matter that contains excess electrons (with a unit negative charge) or protons (with a unit positive charge). Therefore, the reason for the magnetic field generated by the current can only be attributed to the magnetic field generated by moving electrons.
A static electron has an inert electron mass and unit negative charge, producing gravitation and unit negative electric field force. When an external force accelerates and makes a stationary electron move, the external force provides kinetic energy for the overall movement of the electron and provides magnetic energy for the magnetic field generated by the moving charge. It can be seen that the magnetic field is a material of magnetic energy injected into the moving electrons through energy conversion by an external force. The magnetic field generated by the current of the neodymium bar magnet or the magnetic field generated by the negatively charged point charge is the macroscopic performance of the magnetic field generated by a large number of moving electrons.
In the same way, the magnetic field generated by a moving positively charged point charge is the macroscopic manifestation of the magnetic energy material obtained by the excess protons from the external force. But its magnetic energy substances are attached to the quarks with electric charges. The physical field that transfers the interaction between moving charges or currents is generated by moving charges or currents. At the same time, it exerts a force on other moving charges or currents in the generating field. A magnetic field is a form of matter.
Between the magnet and the magnet, force and moment are applied to each other through the magnetic field generated by each. The charge in motion generates a magnetic field. A charge movement model can explain the magnetic field generated by a magnetic substance. Electric charges generate the electric field. There is a close relationship between electric field and magnetic field; sometimes, a magnetic field induces an electric field, and sometimes an electric field generates a magnetic field. Maxwell's equations describe the detailed relationship between the electric field, magnetic field, and vector field.
According to the special theory of relativity, electric and magnetic fields are the two sides of electromagnetic fields. Set two reference systems A and B. Relative to reference system A, reference system B moves at a finite speed. Observe the pure electric field generated by static charges from reference frame A, and observe the electric field and magnetic field generated by the moving charges from reference frame B.
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