What is a Bar Magnet?

A bar magnet refers to a magnet having a shape of a bar with poles at both ends.

1. The magnetic induction line around the magnet is from the N pole of the magnet and back to the S pole;

2. The magnetic induction lines will not cross;

3. The magnetic field is dense where the magnetic lines are dense and the magnetic field is weak;

4.

1.Antimagnetic

Antimagnetic is a kind of substance, which is weak to the magnetic field when it is in an external magnetic field.

Bar magnet traditional industry

In describing the magnetic source, electromagnetic induction, and magnetic devices of magnetic materials, we have already mentioned the practical application of some magnetic material electromagnets. In fact, magnetic materials have been widely used in various aspects of traditional industries.

For example, without magnetic materials, electrification becomes impossible because electricity is generated by generators, power transmission by transformers, electrical machinery by electric motors, telephones, radios, and televisions using speakers. Many instruments use magnetic steel coil structure. These are already mentioned in the other content.

Bar magnet astronomy field

China has recorded the Northern Lights since ancient times. The northern lights are actually the result of the interaction between particles in the solar wind and the geomagnetic field. Solar wind is a stream of high-energy charged particles emitted by the sun. When they reach the earth, they interact with the geomagnetic field, just as if a current-carrying wire was stressed in the magnetic field, causing these particles to move and converge toward the north and south poles, and collide with the thin gas at high altitude on the earth, resulting in gas Molecules are excited to emit light.

Sunspots are areas where the magnetic field activity on the sun is very intense. The outbreak of sunspots will affect our lives, such as temporarily interrupting radio communications. Therefore, studying sunspots is of great significance to us.

Geomagnetic changes can be used to explore deposits. Because all materials have strong or weak magnetism, if they gather together to form a mineral deposit, it will inevitably interfere with the geomagnetic field in the nearby area, making the geomagnetic field abnormal. According to this point, the magnetism of the earth can be measured on land, sea or air, and geomagnetic maps can be obtained. Analysis and further exploration of areas with abnormal magnetic fields on the geomagnetic map can often find unknown mineral deposits or special geological structures. Rocks of different geological ages often have different magnetic properties. Therefore, changes in geological age and crustal changes can be judged based on the magnetic assistance of rocks.

Many mineral resources are symbiotic, that is, several minerals are mixed together, and they have different magnetic properties. Utilizing this feature, people have developed magnetic separators that make use of the different magnetic properties of different composition minerals and the difference in magnetic strength. If these materials are attracted with magnets, the attractive forces they receive will be different, and as a result, they will be mixed together. Different magnetic minerals are separated to achieve magnetic beneficiation. ^[1]