Strong magnet fortune telling _ Is strong magnet fortune telling accurate?

1. What is the knowledge of magnets?

First, the magnet

Magnets can attract iron objects. This property is called magnetism. Generally speaking, the magnetic force of a magnet is fixed (to compare the magnetic force, it can be judged according to the number of paper clips attracted by a magnet. )

Second, the shape of the magnet.

Magnets have various shapes (U-shaped, ring-shaped, bar-shaped, cylindrical, etc.). ) Because they have different uses. Magnets cannot attract metals such as copper and aluminum. (Cobalt and nickel can be attracted)

Third, the nature of magnets.

1. Magnets can refer to the north-south direction. The magnetic pole of the guide rail is called the south pole, which is represented by "S"; The magnetic pole pointing to the north is called the North Pole and is represented by "n".

2. When the magnetic poles of two magnets are close to each other, they sometimes attract each other, which is called mutual attraction; Sometimes they push to both sides, which is called mutual repulsion. (We call it same-sex repulsion, same-sex attraction)

Magnets can also adsorb iron through some objects. Iron objects can be separated from other objects, and magnets can be used to attract iron objects. )

4. The magnetic force of the magnet is strong at both ends and weak in the middle. The part with the strongest magnetic force on a magnet is called a magnetic pole, and a magnet has two magnetic poles.

5. When two magnets are attracted together, the magnetic force will increase; When two mutually repulsive magnetic poles are combined, the magnetic force will decrease.

Fourth, the application of magnets-compass

1. Compass is an instrument that uses the property that magnets can refer to the north and south to indicate the direction. An ordinary compass consists of a magnetic needle and an azimuth disk. Compass is the result of China ancient working people's understanding of magnet magnetism in long-term practice. More than 2000 years ago, the ancients in China created Sina.

2. Use the compass to determine the direction:

(1) Put the compass box flat and let the magnetic needle rotate freely.

(2) After the magnetic needle stops swinging, rotate the compass box to make the south (S) and north (N) directions marked on the azimuth dial consistent with the south and north directions pointed by the magnetic needle.

(3) Determine all directions according to the azimuth dial.

3. the meaning of the letters on the compass dial: n-north; South by south; w-west； Oriental electronics; Northeast by northeast; Southeast-southeast; NW- Northwest; Southwest.-southwest.

You can make a compass with steel needles, nails and other things. Rub the magnetic pole of the magnet on the steel needle (or nail) in one direction and repeat it for 20 to 30 times. Then mark the south pole and the north pole.

5. Other applications of magnets: Maglev trains are suspended by magnetic forces that repel each other.

2. Knowledge about magnets

Magnets are made up of atoms such as iron, cobalt and nickel. Their atoms have special internal structures and have their own magnetic moments. Magnets can generate magnetic fields and attract ferromagnetic substances, such as iron, nickel, cobalt and other metals.

Types of magnets

1, shape magnet. Square magnet, tile magnet, irregular magnet, cylindrical magnet, ring magnet, disc magnet, bar magnet, magnet frame magnet.

2. Attribute magnet. Sm-Co magnet, Nd magnet (strong magnet), ferrite magnet, Al-Ni-Co magnet, Fe-Cr-Co magnet.

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

4. Magnets are divided into permanent magnets and soft magnets. Permanent magnets strengthen magnetism, so that the spin of magnetic substances and the angular momentum of electrons are arranged in a fixed direction, while soft magnets are electrified.

Extended data:

The discovery of magnets.

Magnets are natural magnetite. The ancient Greeks and China discovered that there was a naturally magnetized stone in nature, called a "magnet". 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. China was the first to discover and use magnets, that is, making a compass with magnets is one of the four great inventions in China.

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.

Baidu encyclopedia-magnet

What do you know about magnets?

Magnetism of magnet

Magnets can generate magnetic fields and attract ferromagnetic substances, such as iron, nickel, cobalt and other metals. Hang the midpoint of the bar magnet with a thin wire. When it is at rest, its two ends will point to the south and north of the earth respectively. One end pointing to the north is called North Pole or N Pole, and the other end pointing to the south is called Guiding Pole or S Pole. If we imagine the earth as a big magnet, the geomagnetic north pole of the earth is the guiding pole at present, and the geomagnetic south pole refers to the north pole. Between magnets, the same sex repels and the opposite sex attracts. So the compass repels the south pole, the north arrow repels the north pole, and the compass attracts the north arrow.

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 artificial (the strongest magnet is neodymium magnet). [1] Non-permanent magnets, such as electromagnets, are magnetic only under certain conditions.

Magnets are not invented by people, but natural magnetite. The ancient Greeks and China discovered that there was a naturally magnetized stone in nature, called a "magnet". 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. China, the "compass", one of China's four great inventions, was the first to discover and use magnets.

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 made in 1950s, and rare earth magnets (including NdFeB and SmCo) were made in 1970s. At this point, magnetic technology has developed rapidly, and ferromagnetic materials have also made components more miniaturized.

What do you know about magnets?

Magnets Magnets can generate magnetic fields and attract ferromagnetic substances, such as iron, nickel, cobalt and other metals.

Hang the midpoint of the bar magnet with a thin wire. When it is at rest, its two ends will point to the south and north of the earth respectively. One end pointing to the north is called North Pole or N Pole, and the other end pointing to the south is called Guiding Pole or S Pole. If we imagine the earth as a big magnet, the geomagnetic north pole of the earth is the guiding pole at present, and the geomagnetic south pole refers to the north pole.

Between magnets, the same sex repels and the opposite sex attracts. So the compass repels the south pole, the north arrow repels the north pole, and the compass attracts the north arrow.

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 artificial (the strongest magnet is neodymium magnet).

[1] Non-permanent magnets, such as electromagnets, are magnetic only under certain conditions. Magnets are not invented by people, but natural magnetite.

The ancient Greeks and China discovered that there was a naturally magnetized stone in nature, called a "magnet". 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. China, the "compass", one of China's four great inventions, was the first to discover and use magnets.

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 made in 1950s, and rare earth magnets (including NdFeB and SmCo) were made in 1970s.

At this point, magnetic technology has developed rapidly, and ferromagnetic materials have also made components more miniaturized. In the modern development of 1822, French physicists arago and Wojciech Luczak found that when current passes through a winding with iron blocks, the iron blocks in the winding can be magnetized.

This is actually the first discovery of the principle of electromagnet. 1823, sturgeon did a similar experiment: he wound 18 turns of bare copper wire on a U-shaped iron bar that was not a magnetic bar. When the copper wire is connected to the photovoltaic cell, the copper coil wound on the U-shaped iron bar generates a dense magnetic field, thus turning the U-shaped iron bar into an "electromagnet".

The magnetic energy of this electromagnet is magnified many times than that of a permanent magnet, and it can absorb iron 20 times heavier than it. When the power supply is cut off, the U-shaped iron bar can't absorb any iron and becomes an ordinary iron bar. Sturgeon's invention of electromagnet made people see the bright future of converting electric energy into magnetic energy, which soon spread in Britain, the United States and some coastal countries in Western Europe.

1829, American electrician Henry made some innovations on the sturgeon electromagnet device. Insulated wires replace bare copper wires, so there is no need to worry about being short-circuited by copper wires. Because of the insulating layer, the wires can be tightly wound round and round, and the denser the coils, the stronger the magnetic field, which greatly improves the ability of converting electric energy into magnetic energy.

By 183 1, Henry has developed a newer electromagnet. Although it is small, it can absorb 1 ton of iron. The invention of electromagnet also greatly improved the power of generator.

5. Information about magnets

Magnets are composed of atoms with special structures such as iron, cobalt and nickel, and the atoms themselves have magnetic moments, so these mineral molecules are generally arranged in disorder.

When magnetic fields interact, they can't show magnetism, but under the guidance of external forces (such as magnetic fields), the molecular arrangement directions tend to be consistent, showing magnetism, which is also commonly known as magnets. Iron, cobalt and nickel are the most commonly used magnetic substances. Basically, magnets are divided into permanent magnets and soft iron. The permanent magnet and strong magnetism make the spin and angular momentum of the magnetic substance arranged in a fixed direction. Adding current to the soft magnet (also a method of adding magnetic force) to remove the soft iron will gradually lose its magnetism.

Magnets are not invented by humans, but there are natural magnetite. It should be China who first discovered and used magnets. Therefore, the compass is one of the four great inventions of China people.

Magnets refer to objects or materials that can generate magnetic fields. They are usually made of metal alloys and have strong magnetism. Traditionally it can be divided into "permanent magnets" and "non-permanent magnets".

Permanent magnets can be natural products, also known as natural magnets, or artificial (the strongest magnet is neodymium magnet). When a non-permanent magnet is heated to a certain temperature, it will suddenly lose its magnetism, which is caused by the arrangement of many "meta-magnets" that make up the magnet from order to disorder. Put the lost magnet into the magnetic field. When the magnetization reaches a certain value, it is magnetized again, and the arrangement of "super magnets" changes from disorder to order.

Basic knowledge: The ancient Greeks and China discovered that there is a naturally magnetized stone in nature, which is called a "magnet". 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. Magnets have developed for thousands of years, and today magnets have become a powerful material in our lives.

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 made in 1950s, and rare earth magnets (including NdFeB and SmCo) were made in 1970s. At this point, magnetic technology has developed rapidly, and ferromagnetic materials have also made components more miniaturized.

Edit the magnetization (orientation) direction of this paragraph. Most magnetic materials can be magnetized to saturation in the same direction, which is called "magnetization direction" (orientation direction). Most magnetic materials can be magnetized to saturation in the same direction, which is called "magnetization direction" (orientation direction).

Non-oriented magnets (also called isotropic magnets) are much weaker than oriented magnets (also called anisotropic magnets). What is the standard industrial definition of "North and South Pole"? [Figure] The definition of the "north pole" of a magnet is that after the magnet rotates at will, its north pole points to the north pole of the earth.

Similarly, the south pole of the magnet also points to the south pole of the earth. How can you tell the north pole of a magnet without labeling it? Obviously, eyes alone can't tell the difference.

You can use a compass to get close to the magnet, and the pointer pointing to the north pole of the earth will point to the south pole of the magnet. How to handle and store magnets safely? Be very careful, because magnets attract each other and may pinch your fingers.

When magnets attract each other, they may also be damaged by collision (knocking off corners or cracking). Keep the magnet away from easily magnetized objects, such as floppy disks, credit cards, computer monitors, watches, mobile phones, medical devices, etc.

Magnets should be kept away from pacemakers. For larger magnets, plastic or cardboard washers should be added between each magnet to ensure that the magnets can be easily separated.

Magnets should be stored in a dry and constant temperature environment as much as possible. How to achieve magnetic isolation? Only the material that can be adsorbed on the magnet can isolate the magnetic field, and the thicker the material, the better the magnetic isolation effect.

What is the strongest magnet? At present, the magnet with the highest performance is rare earth magnet, and NdFeB is the magnet with the strongest performance among rare earth magnets. But in the environment above 200 degrees Celsius, samarium and cobalt are the strongest magnets.

Edit the types of magnets in this paragraph [Figure] Magnets should be called magnetic steel, English Mag, and magnetic steel is now mainly divided into two types, one is soft magnetic and the other is hard magnetic; Soft magnetic includes silicon steel sheet and soft magnetic core; Hard magnets include Al-Ni-Co, Sm-Co, Ferrite and NdFeB, among which Sm-Co is the most expensive, Ferrite is the cheapest and NdFeB has the highest performance, but Al-Ni-Co has the most stable performance and the best temperature coefficient. Users can choose different hard magnetic products according to different needs.

6. What has a magnet around you?

1, compass

An instrument that uses a magnetic needle to determine direction. It is used to measure the magnetic azimuth or magnetic quadrant angle of the ground line. A compass consists of a compass box, a sight and a magnetic needle. It is simple in structure and convenient to use, but its accuracy is low.

2. compass.

In ancient times, it was called Sina, and its main component was a magnetic needle mounted on the shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and keep in the tangent direction of magnetic meridian, and the south pole of the magnetic needle points to the geographical south pole (magnetic north pole), so we can use this property to judge the direction.

3. magnets.

Magnetite is composed of iron, cobalt, nickel and other atoms, and its internal structure is quite special. Magnets can generate magnetic fields and attract ferromagnetic substances, such as iron, nickel, cobalt and other metals.

4. generator.

The general principle of its construction is that the magnetic circuit and the circuit of mutual electromagnetic induction are composed of appropriate magnetic and conductive materials, so as to generate electromagnetic power and achieve the purpose of energy conversion.

5. motor.

Motor is a kind of equipment that converts electrical energy into mechanical energy. It uses the electrified coil (stator winding) to generate a rotating magnetic field, which acts on the rotor (such as squirrel-cage closed aluminum frame) to form a magnetoelectric rotating torque.