What to know about magnets, what to know about magnets

You're talking about magnetic field lines! Well, you can know the rules, and as for those that are irregular, you can put the magnet on the white paper, and then sprinkle the white paper with fine iron filings, and look at their arrangement. Personally, I don't think it's necessary to know anything other than the rules.

FYI.

The composition of the magnet is iron, cobalt, nickel and other atoms, and the internal structure of the atoms is relatively special, and it itself has a magnetic moment. Magnets are capable of generating magnetic fields and have the property of attracting ferromagnetic substances such as iron, nickel, cobalt and other metals.

Magnet type. 1. Shape like magnets. Square magnets, tile magnets, shaped magnets, cylindrical magnets, ring magnets, disc magnets, bar magnets, magnet stand magnets.

2. Attribute magnets. Samarium cobalt magnets, NdFeB magnets (powerful magnets), ferrite magnets, Alnico magnets, iron-chromium-cobalt magnets.

3. Industry magnets: magnetic components, motor magnets, rubber magnets, plastic magnets, etc.

4. Magnets are divided into permanent magnets and soft magnets, permanent magnets are added with strong magnetism, so that the spin and angular momentum of magnetic substances are arranged in a fixed direction, and soft magnets are coupled with electricity.

This week, in the second volume of the Magnet Unit in the second grade of the preparation class, "How Magnets Attract Objects", because I did an interview in advance, I found that many students think that magnets can attract objects through iron sheets, because iron sheets can be magnetized, and then attract iron objects, and I think so. However, the magnet written in the teaching staff could not attract iron objects through the iron sheet, and the reason was not stated, which aroused my curiosity, and I tried it with the motherboard (iron product) of the computer, but it really couldn't attract, I don't know if it was because it was too big, so it couldn't be magnetized. The iron piece I bought on the Internet has not yet arrived, because I feel that the teaching ginseng is generally not wrong, so I urgently want to know why, the feeling in my common sense is that it can be magnetized and then attract objects, so wow asked my father, he is a physics teacher should understand, but his answer is the same as me said that it can be magnetized and then attracted, and then several physics teachers in their group discussed a lesson because of this problem, some teachers think that they can be attracted (that is, they can be magnetized), and some teachers think that they can't (1

Pieces of iron can interfere with the magnetic field2Because the magnet iron sheet and the iron-containing substance form a new magnet, and the magnet is magnetic at both ends, and the magnet is the weakest in the middle, so it is not possible) and the teacher thinks that depending on the situation, the hoof-shaped magnet is not good, because it will form a closed loop, and the bar magnet can. Later, I consulted the physics teacher of our school and the physics teacher of No. 7 Middle School, and everyone gave different opinions.

At this time, I was about to be dizzy, and then I found that the student's book splint was made of iron, and after trying it, I found that I couldn't be attracted.

The iron sheet finally arrived on Friday night, and the experiment found that the magnet can attract the iron-containing car through the iron piece I bought.

Now I'm more curious, I want to ask if there is a teacher who has taken this class or knows this knowledge, science is really endless, and it also requires science teachers to have rich knowledge reserves, and they need to have the spirit of questioning and **!

The same poles repel each other, and the opposite poles attract.

Same-sex repulsion, opposite-sex attraction!

A magnet is an object that can generate a magnetic field, which is a magnetic dipole that can attract ferromagnetic materials such as iron, nickel, cobalt and other metals. The magnetic pole is determined by hanging a magnet with a thin line, the magnetic pole pointing to the north is called the north pole or n pole, and the magnetic pole pointing to the south is the guide pole or the s pole. (If we think of the Earth as a big magnet, then the current geomagnetic north pole of the earth is the s pole, and the geomagnetic south pole is the n pole.)

Magnets attract at opposite poles and repel at the same poles. The compass pole attracts the north pole, the compass pole repels the compass pole, and the north pole repels the north pole.

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 regions 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 clearly 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 first to discover and use magnets should be the Chinese, and the "compass" is one of the four major inventions in China.

Classification of magnets.

Magnets 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 magnets are neodymium magnets). Instead of permanent magnets, they are only magnetic under certain conditions, usually in the form of electromagnets, that is, using an electric current to strengthen their magnetic field.

Conversion of magnets to magnets.

The magnetic molecules inside the unmagnetized magnet (molecular magnet theory) are irregularly arranged, and the magnetic molecules will be arranged regularly after the process of magnetization. In this case, the n and s poles of the magnetic molecule will face the same direction, making the magnet magnetic and becoming a magnet. At the same time, there are opposite poles on the same magnet and the magnetic quantities of the two poles are equal.

Main ingredients: Magnets, also known as magnets, refer to objects or materials that have magnetic fields around and within themselves, and are divided into two categories: natural and man-made. Artificial magnets are usually made of metal alloys, which are highly magnetic.

It can also be divided into "permanent magnets" and "non-permanent magnets", that is, "hard magnets" and "soft magnets". The main components of natural magnets: ferric oxide, chemical formula Fe3O4, often called "magnetic iron oxide".

A black crystal with magnetic properties. It can be seen as a compound composed of ferrous oxide and iron oxide. Because there are two ions with different valence states in the ferric oxide crystal, one-third of which are Fe2+ and two-thirds Fe3+, it is a complex compound.

It is insoluble in water and cannot react with water. Reacts with acids and is insoluble in alkalis. It is mainly used to make primers and topcoats, magnetic materials for the electronics industry, and rust inhibitors for the construction industry.

Permanent magnets.

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

Hello, the composition of the magnet is iron, cobalt, nickel and other atoms, the internal structure of the atom is relatively special, itself has a magnetic moment, so the magnet can produce a magnetic field, with the characteristics of attracting ferromagnetic substances, such as attracting iron, nickel, cobalt and other metals. In our country, magnets are also called magnets. Magnets were not invented by humans, but natural magnetite.

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 the earliest compass to discern direction at sea.

The first to discover and use magnets should be Chinese, our ancestors in the Warring States era have accumulated a lot of understanding in this area, in the exploration of iron ore often encounter magnetite, that is, the main component of iron oxide magnets, these discoveries have been recorded very early, "Pipe" first recorded these discoveries: "There are magnets on the mountain, and there is gold and copper under them." The Chinese also first used magnets to make the "compass", which is also one of China's four major inventions.

And today magnets have become a powerful material in our lives. In the 18th century, man-made magnets appeared, but the magnetic force was not.

Artificial magnets appeared in the 18th century, but the magnetic force was not strong until the 20s of the 20th century when Alnico was manufactured. Subsequently, ferrites were manufactured in the 50s of the 20th century, and rare earth magnets were manufactured in the 70s. So far, magnetism technology has developed rapidly, and the application of strong magnetic materials has also made components more miniaturized.

Smile] Hope it helps.