Electromagnetic properties of carbon fiber

Because carbon fibers can conduct electricity, if added to plastics or rubbers, they can impart conductivity to materials, be used to remove static electricity, or be used to electrically heat bodies. In addition, because carbon fiber reflects medium and long wavelengths, it can be used for electromagnetic shielding. For example, CFRP is used in the storage room of communication equipment, or as the hood of the automobile, TV antenna, reflector, etc.

However, the conductivity of carbon fiber will also cause some troubles. For example, if the fiber is scattered during processing, it is likely to cause a short circuit accident. Therefore, it is necessary to coat the surface of the detector, switch and other components with an insulating coating, vacuum dust, or add Install some lint removal equipment. In addition, if the wool enters the socket socket, it is easy to cause a short circuit, so be careful when cleaning the workshop.

Compared with metal, carbon fiber has good X-ray transmittance, the X-ray absorption of CFRP is only about 1/10 of that of aluminum or glass fiber reinforced plastic (GFRP), and due to its strength and rigidity, The X-ray transilluminator for human body can reduce the amount of X-ray radiation to the human body.

The principle of electromagnetism

Electromagnetism is the reaction of energy and is a general term for the electrical and magnetic properties of matter, such as electromagnetic induction, electromagnetic waves, electromagnetic fields and so on. All electromagnetic phenomena are inseparable from electric fields: whereas magnetic fields are produced by moving electric charges (electricity).

A moving charge can create fluctuations. Its fluctuation mechanism is that when the moving electric charge e moves, it is bound to be hindered by its adjacent e, and the moving electric charge drives its adjacent 1 to move upward, that is, the adjacent moving upward together with the moving electric charge e: when the adjacent electric charge moves upward, it is bound to be affected by its own adjacent. The obstruction of electric charge is manifested in that the adjacent charge drives its own adjacent charge to move upward, that is, the adjacent charge moves upward together with another adjacent charge. This spreads forward in this way, forming a wave. Obviously, the propagation speed of such waves in a vacuum is the speed of light.

Electromagnetic quality

Electromagnetic mass originates from the part of the electromagnetic field. Its value can be estimated from the electromagnetic field momentum or basis of the uniformly moving electron, and the mass-energy relationship is estimated from the electrostatic field energy of the stationary electron. In the early days of the development of electron theory, it was assumed that the electromagnetic mass of the electron was equal to the mass determined in the experiment. And thus calculate his radius, which is called the classical radius of the electron.

When an object has an electric field or a magnetic field, the object is electrically or magnetically shielded, and the object is weighed with a balance. All devices (including the shielding body), the weighed data is different from that without an electric field or a magnetic field.

The data obtained by the balance is the mass. Due to the shielding of the object, the weighing process does not interfere with the balance. The weighing result data is valid. Therefore, for the same object, in addition to conventional mass, there is also electromagnetic mass.