The reason why magnets repel each other on the same horizontal plane
According to the most basic electromagnetic law, two parallel lines with the same current direction will produce gravity, and vice versa. Similarly, if current in the same direction is applied to two parallel coils, attractive force will also be generated.
One side of the coil produces a south magnetic field and the other side produces a north magnetic field. As mentioned above, the south pole of one coil is just opposite to the north pole of the other coil, resulting in attraction.
There are electrons in the atoms inside the magnet rotating around the core, just like an electric current, so each atom is like a small charged coil. When many such small electrified coils are arranged in one direction, a magnet is formed macroscopically. It produces the mechanism of repulsion at the same level and attraction at different poles.
The principle that magnets repel each other at the same level and attract each other at the opposite sex.
Each magnet has a positive electrode and a negative electrode, and there is a magnetic field around the magnet. When the same poles of two magnets are close to each other, because the magnetic fields repel each other, the two magnets seem to have a force to separate them. When two different poles are close, they will attract each other. Simply put, the repulsion of a magnet is caused by the magnetic field in the magnet. This is also what physics says: like-minded people repel, like-minded people attract.
Magnetism is formed entirely by electric current. Magnets are paired, with north and south poles, and no monopole exists. This constitutes a magnetic field and a gravitational field, and the electric field is different. The magnetic field must be an annular junction without a breakpoint, from north to south outside the magnetic block and from south to north inside the magnetic block. Charge accelerates the attraction of electric field, just as proton accelerates the gravitational field. But the magnetic dipole (small north-south pole pair, small compass) will only be rotated by the magnetic field, making it point in the direction of the magnetic field.
The unit ampere of current implies a force, that is, when two charged bodies with infinite distance 1 m and small parallel cross sections pass through the current of 1 amp, they will generate a suction force or a thrust force of 1 Newton per meter length (depending on the current direction, they repel in the same direction and attract in different directions). This definition implies the relationship between electricity and magnetism (both related to force) through permeability.
Look at the dimension, any charged body F=BLI 1.
Newton = 1 Newton/ampere meter * 1 meter * 1 ampere
According to ampere's law, the product of the component of magnetic flux density in the direction of magnetic circuit and the length of magnetic circuit (B(2) (Pi) (R)) is the product of absolute permeability and current (absolute permeability *I).
B(2) (Pi) (R)= absolute permeability * i.
B(2) (Pi) (R))/(I)= absolute permeability.
B (Newton/Ampere) /I (Ampere) = Absolute permeability (Newton/Ampere 2)
This closely expresses (magnetic flux density) and (exciting force) through current (meaning of force). It also implies that the current loop and the magnetic loop are locked together, and magnetism can be determined by electricity, and vice versa, which is the meaning of force. Is this just the explanation that the coil is electrified to produce magnetism? We can generalize it. Given a magnetic block and knowing its B, can we deduce its excitation current? Yes, obviously there is no current. What is the explanation for the current? This has the basis from macro to micro, that is, the electrons (charges) of the object move in the object to form a closed-circuit current. It can be regarded as a tiny current generated by the rotation of electrons on the surface of electrons, or as a flux and its connection. Can the revolution and rotation of electrons also have magnetic flux? This should also be something of quantum mechanics. There are many dipoles in the object, which are easy to gather and strengthen the magnetic flux density under the guidance of the outside world, making the magnetic permeability relatively high and famous polarization.
The stress of the small iron block near the magnetic block was investigated. Firstly, the small iron block is polarized into a small magnetic block, and then the small magnetic block is twisted to make it consistent with the magnetic flux direction of the magnetic block. The polarization process also determines that the virtual current data F=BLI is attracted by the magnetic block with F force. The degree of polarization of an object determines its strength. If an object cannot be polarized at all, then it has no magnetic attraction at all, and high relative permeability is the performance of high polarization.
If there is a small magnetic block near the magnetic block, then this small magnetic block is twisted to align with the magnetic flux direction of the magnetic block, and then this small magnetic block is polarized by the magnetic block, and the last small magnetic block B has a virtual current according to F=BLI, which is attracted or repelled by the magnetic block with f force.
Magnet repulsion principle
The property of attracting iron, cobalt, nickel and other substances is called magnetism. The regions with strong magnetism at both ends of the magnet are called magnetic poles, one end is called North Pole (N Pole) and the other end is called South Pole (S Pole). Experiments show that like magnetic poles repel and opposite magnetic poles attract.
Most substances are made up of molecules, molecules are made up of atoms, and atoms are made up of nuclei and electrons. Inside the atom, electrons keep spinning around the nucleus. Both of these movements of electrons will produce magnetism. But in most substances, the direction of electron movement is different and chaotic, and the magnetic effects cancel each other out. So most substances are nonmagnetic under normal circumstances.
Ferromagnetic substances such as iron, cobalt, nickel or ferrite are different, and their internal electron spins can be arranged spontaneously in a small range to form spontaneous magnetization regions, which are called magnetic domains. After the ferromagnetic substance is magnetized, the internal magnetic domains are arranged neatly and in the same direction, so that the magnetism is enhanced and a magnet is formed. The process of magnet absorbing iron is the process of iron block magnetization. Magnetized iron blocks and magnets attract each other with different polarities, and the iron blocks and magnets are firmly connected. Sticky? Together. Suppose the magnet is magnetic.
Magnetic domain theory is to explain the magnetization mechanism of ferromagnetic materials from a microscopic point of view with quantum theory. The so-called magnetic domain refers to the small areas inside the magnetic material, and each area contains a large number of atoms. The magnetic moments of these atoms are arranged neatly like small magnets, but the directions of atomic magnetic moments are different between adjacent regions, as shown in the figure. The interface between domains is called domain wall. Generally speaking, macroscopic objects always have many magnetic domains. In this way, the directions of magnetic moments of magnetic domains are different, and the results cancel each other out. The vector sum is zero, and the magnetic moment of the whole object is zero, so it cannot attract other magnetic substances. In other words, magnetic materials will not show magnetism to the outside under normal circumstances. Magnetic materials can only show magnetism when they are magnetized.
1928 Heisenberg introduced quantum mechanics into Weiss's ferromagnetic theory, and explained the origin of magnetism according to localized spin exchange. 1932 discovered diamagnetism and ferrimagnetism in the inner ear and successfully explained these phenomena. 1970 won the physics prize. Van flock and Anderson won the physics prize of 1977 for their basic research on the electronic structure of magnetic and disordered systems. 1926, jiaoke proposed adiabatic demagnetization and won the 1949 chemistry prize.
The discovery of magnets
The ancient Greeks and China discovered a naturally magnetized stone in nature, which they called? Magnetite? . This kind of stone can magically pick up a small piece of iron and swing it at will and always point in the same direction. Early navigators used this magnet as their earliest compass to tell directions at sea.
After thousands of years of development, magnets have become a powerful material in our life today. By synthesizing alloys of different materials, we can achieve the same effect as magnets and improve the magnetic force. /kloc-artificial magnets appeared in the 0/8th century, but the process of making stronger magnetic materials was very slow, and Al-Ni-Co was not produced until the 1920s. Subsequently, ferrite was manufactured in 1950s and [rare earth magnets [including NdFeB and SmCo]] was manufactured in 1970s. At this point, magnetic technology has developed rapidly, and ferromagnetic materials have also made components more miniaturized.
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