Can anyone tell me about the principle of magnets or a little story about the principle of magnets.

In the pre-Qin period, our ancestors had accumulated a lot of knowledge in this area, and when exploring iron ore, they often encountered magnetite, that is, magnets (the main component is ferric tetroxide). These discoveries were documented very early. These discoveries are first documented in several chapters of the Pipe:

There is a magnet on the mountain, and there is gold and brass under it. Other ancient texts, such as the Classic of Mountains and Seas, have similar records. The iron-absorbing properties of magnets have been discovered very early, and the nine volumes of "Lü's Spring and Autumn" have mastery chapters

Ci Zhao Tie, or lead to it. At that time, people called "magnetism" "compassion", and they saw the magnet's attraction to iron as a mother's attraction to her children. And think:

The stone is the mother of iron, but there are two kinds of stones: benevolent and unkind, the loving stone can attract his children, and the unkind stone cannot attract him. Before the Han Dynasty, people wrote the magnet as "Cishi", which means loving stone.

Since magnets attract iron, can they also attract other metals? Our ancestors made many attempts and found that magnets could not attract not only metals such as gold, silver, and copper, but also bricks and tiles. In the Western Han Dynasty, people have realized that magnets can only attract iron, but not other items.

When two magnets are placed close to each other, sometimes they attract each other and sometimes repel each other. Now people know that magnets have two poles, one called the n pole and the other called the s pole. Opposite-sex poles are mutually exclusive, and opposite-sex poles attract each other.

At that time, people didn't know about this truth, but they were still aware of it. In the Western Han Dynasty, there was a monk named Luan Da, who used this property of the magnet to make two chess pieces, by adjusting the mutual position of the polarity of the two chess pieces, sometimes the two chess pieces attracted each other, sometimes they repel each other. Luan Da called it "fighting chess".

He dedicated this novelty to Emperor Wu of Han and demonstrated it on the spot. Emperor Wu of the Han Dynasty was amazed, and the dragon's heart was so happy that he actually named Luan Da as the "General of Wuli". Luan Da used the nature of the magnet to make a novel gadget to deceive Emperor Wu of the Han Dynasty.

The Earth is also a large magnet, and its two poles are close to the geographic south pole and the geographic north pole respectively. Therefore, when the magnets on the earth's surface can rotate freely, they will be repelled by the same sex of the magnets, and the opposite sex attracts the opposite sex. The ancients didn't understand this truth, but they knew this kind of phenomenon very well.

The composition is iron, cobalt, nickel and other atoms have a special internal structure, and the atoms themselves have magnetic moments. In general, the arrangement of these mineral molecules is chaotic. Their magnetic fields affect each other and do not show magnetism, but under the guidance of external forces (such as magnetic fields), the direction of the arrangement of their molecules will tend to be the same, and their magnetism will be displayed, which is what we usually call magnets.

Magnets are divided into permanent magnets and soft iron, permanent magnets are added with strong magnetism, so that the spin of magnetic substances and electron angular momentum are arranged in a fixed direction, and soft magnetism is to add current (also a method of adding magnetic force) and other currents to remove soft iron will slowly lose magnetism.

The ancient Greeks and Chinese discovered that there is a natural magnetized stone in nature and called it "magnet stone". The stone magically picks up small pieces of iron, and always points in the same direction after swinging at will. Early voyagers used this magnet as their earliest compass to discern direction at sea.

Magnets are not invented by man, they are natural magnetite. The first to discover and use magnets should be the Chinese, that is, the "compass", one of the four great inventions in China.

Magnets have magnetic fields that flow from the south pole to the north pole. The magnetic field is supposed to be a high-energy particle. Of course, to distinguish it from gravity, gravity is present in all matter, and its magnitude depends on the mass of the substance itself, and many people think of gravity when they hear a magnet, in fact.

One. There was a magnet, very greedy, and when he saw iron, he frantically took it into his bosom and took it for himself.

One day, when I saw a tall tower, I was very excited, and I thought to myself, if I can suck this tall tower into my arms and take possession of it, then I will have the most iron and become the richest magnet in the world.

Thinking of this, Magnet couldn't wait to get close to the tower, but it exerted all its strength, and couldn't suck the tower into its arms, but was manipulated and controlled by a powerful force of the tower, like a puppet, it was pulled over by the tower step by step, and finally, the magnet was firmly adsorbed on the sole of the tower's feet, unable to move.

A piece of magnetism, because of his extreme greed for iron, ended up becoming a prisoner and captive of iron.

Two. A piece of iron, deeply attracted by a piece of magnetism.

Iron can't help but go to magnetism step by step. In the end, Iron couldn't suppress the frenzied heartbeat in his heart and threw himself into Magnetic's arms.

Magnetic Liquid Loss hugged the iron tightly. Iron, embraced by magnetism, is immersed in an indescribable happiness.

Over time, gradually, the iron could no longer feel the gravitational pull of magnetism. Iron wants to leave magnetism.

And the magnet said to the iron: the day you leave me, you will feel my deep concern for you.

Three. It's me who attracts you! Magnetism said to iron.

It's me who attracts you! Iron said to magnetism.

One day, magnetism and iron quarrel over the question of "who attracts whom".

Tell me, how did you attract me? Magnetism and iron asked each other almost in unison.

Can you attract copper, attract aluminum, attract tin? No, not one! This shows that you are not attractive at all, it is me who is attractive, and it is I who attracts you. Magnetism said to iron.

Can you attract wood, dirt, and stone? No, not one! This proves that you are not attractive at all, it is me who is attractive, and it is I who attracts you. Iron said to magnetism.

Magnetism and iron, if we understand the truth that "attraction is mutual", there will be no more such pointless quarrels.

Four. Two pieces of buried magnetism, you reject me, I reject you, each does not give in, and they can't go together at all.

At this time, one of the magnets turned around, changed his face, changed his posture, smiled, stretched out his hand, and walked towards the other magnet. Strangely, the attitude of the other magnet also made a 180-degree turn, and with a smile, he stretched out his hand and walked towards the other party. The two pieces of magnetism, which were originally mutually repellent, finally hugged each other tightly.

The communication between the two enlightened gods is actually the communication of two people.

Responsibility: Associate Editor-in-Chief).

Magnets attract iron, cobalt, nickel, and other substances. The principle is that the magnetic field generated by the electric current magnetizes other objects, and the magnetized objects produce electric fields, and the electric fields interact with each other to produce the action of force.

Magnets attract iron, cobalt, nickel, and other substances. The magnetic collision domain at both ends of the magnet is called the magnetic pole, one end is called the north pole (n pole), and the other end is called the south pole (s pole). Experiments have proved that the poles of the same name repel each other, and the poles of different names attract each other.

Inside the atom, the electrons rotate incessantly and revolve around the nucleus. Both of these motions of electrons produce magnetism. But in most matter, the direction of electron movement is varied and chaotic, and magnetic effects cancel each other out.

Therefore, most substances are not magnetic under normal conditions.

Because of the rotation of the earth, its magnetic field and electric current will continue to combine strongly, and finally the whole earth will become a large magnetic field. Earth's minerals such as nickel, cobalt, iron, and other materials rotate because of the earth's rotation, thus becoming natural magnets.

The midpoint of the bar magnet is hung with a thin wire, and when it is stationary, its two ends point to the south and north of the earth, the one end pointing north is called the north pole or n pole, and the one end pointing south is the guide pole or s pole.

If you think of the Earth as a large magnet, the Earth's magnetic north pole is the guide pole, and the geomagnetic south pole is the north pole. Between magnets and magnet brothers, the poles of the same name are repelled and the poles of different names are attracted. Therefore, the compass and the South Pole album are repulsed, the north arrow is repelled from the North Pole, and the compass and the north arrow are attracted.

An electromagnet is a device that uses an electric current to generate a magnetic field. Its principle is based on Ampere's law and Faraday's law of electromagnetic induction. When an electric current is passed through a wire, a magnetic field is generated, and the direction of this magnetic field is perpendicular to the direction of the current, and the magnitude is proportional to the strength of the current.

If the wire is wound into a coil, then this magnetic field will form a magnetic field in the coil, and the direction of this magnetic field is related to the direction of the coil, and the magnitude is proportional to the current intensity and the number of turns of the coil.

When an electric current passes through the coil of an electromagnet, a magnetic field is generated in the coil. This magnetic field attracts ferromagnetic substances such as iron, nickel, cobalt, etc. When the current stops, the magnetic field also disappears and so does the force of attraction.

Therefore, the attraction of the electromagnet can be controlled, just to control the magnitude and direction of the current.

Electromagnets are widely used, such as electric motors, generators, speakers, maglev trains, etc. In an electric motor, the coil of the electromagnet is placed on the rotor, and when an electric current passes through the coil, a magnetic field is generated that attracts the ferromagnetic material on the rotor, causing the rotor to rotate. In a loudspeaker, the coil of the electromagnet is placed on the diaphragm, and when an electric current passes through the coil, a magnetic field is generated that attracts the ferromagnetic material on the diaphragm, causing the diaphragm to vibrate and produce sound.

A magnet is an object or material that can generate a magnetic field, usually made of a metal alloy and is highly magnetic. Traditionally, they can be divided into "permanent magnets" and "non-permanent magnets".

Permanent magnets can be natural products, also known as natural magnets, or they can be artificially manufactured (the strongest magnet is neodymium magnets).

Non-permanent magnets, which sometimes lose their magnetism.

A hypothesis proposed by Anpere, a physics scientist to explain the magnetism of magnets. Ampere believes that there is a toroidal current inside the molecules that make up the magnet, similar to a miniature solenoid current, called molecular current or ampere electric current. Due to the presence of molecular currents, each magnetic molecule becomes a small magnet with two poles on either side.

Normally, the molecular current orientation of the magnet molecules is chaotic, and the magnetic fields they produce cancel each other out and are not magnetic. For example, after the iron rod is magnetized by the external magnetic field, the orientation of the molecular current is roughly the same, and the adjacent currents between the molecules cancel each other, but on the surface of the iron rod, the part of the molecular current to the surface is not canceled, and their effect is equivalent to a strong current flowing through the surface of the iron rod. This current is called magnetizing current, and it can generate a strong magnetic field, forming two poles at both ends of the iron rod.