How to distinguish the poles of a magnet？

What is a magnetic pole

The most magnetic part of the magnet is called the pole. There is a magnetic field around the magnet, and the interaction between the magnets is mediated by the magnetic field. No matter how small a magnet is, it has two magnetic poles. A magnet that can rotate freely in the horizontal plane. When at rest, one magnetic pole points to the south and the other magnetic pole points to the north. The one pointing to the south is called the south pole, and the one pointing to the north is called the north pole. There is a phenomenon that the magnetic poles of the same name repel each other and the magnetic poles of different names attract each other. Folding a magnet into two sections does not separate its north pole from its south pole, but each half of the magnet has its own north and south poles. This is the basic characteristic of magnetic phenomena.

The earth is a huge magnet, and it also has two poles. The positions of these two magnetic poles are very close to the south and north poles of the earth. People call the magnetic pole near the north pole of the earth the geomagnetic south pole and the other magnetic pole as the geomagnetic north pole. The most magnetic part of the magnet. For example, the two ends of a bar magnet have the strongest magnetism. If the bar or needle magnet is suspended in the geomagnetic field, the two poles always point to the north-south direction and the north-south pole respectively. It is called the magnetic north pole , and the one that points south is called the magnetic south pole. The poles with different names of different magnets attract each other; the poles with the same name repel each other. The poles of any magnet always appear in pairs. Folding a magnet into two sections does not separate its north pole from its south pole, but each half of the magnet. Each has its own north and south poles, which are the basic characteristics of magnetic phenomena.

Magnetic field is closely related to us

The earth's magnetic field swallows cosmic rays. If the earth's magnetic field disappears, these solar particle storms will slam the earth's atmosphere and have a fatal impact on the earth's climate and human destiny. Some low-orbit satellites will also be completely exposed to the solar electromagnetic storm, and will be completely destroyed soon.

These changes will bring great danger to spacecraft such as satellites, because the earth's magnetic field has a protective effect on high-energy radiation from outer space, just like putting a layer of radiation protection suit on spacecraft such as satellites. If the earth's magnetic field changes, thousands of satellites and other spacecraft orbiting the earth will lose the protection of the earth's magnetic field, and they will be exposed to high-energy radiation from outer space without protection.

In addition, many creatures that rely on the earth's magnetic field to navigate, such as swallows, antelopes, whales, pigeons, and magnetotactic bacteria, will lose their way.

How to identify the direction of the magnetic field

Take a long strip magnet with known magnetic poles, and based on the principle of repulsion of the same poles and attraction of different poles, it is easy to identify the magnetic poles.

If there are no other magnetic materials such as magnets, if the magnet can float in the water, you can put the magnet in the water. The magnet that rotates freely in the horizontal plane will always have one pole pointing to the south, the other pole pointing to the north, and the one pointing to the south is south pole, the north pole pointing north.

The two ends of the bar magnet have the strongest magnetism and are the two poles. The magnet can be hung with a string. When it is still, one magnetic pole points to the south, the other magnetic pole points to the north, the south pole points to the south, and the north pole points to the north.

Or roll the magnet on the sand a few times, and you will find the distribution of iron filings in the sand on the magnet. The iron filings at both ends have vertical magnet growth. These two ends are the two poles of the spherical magnet. You can determine its north pole and south pole by trying a bar magnet with north and south pole. Then judge by the compass. When the compass is stable, take one pole of the magnet to the north pole of the compass. If it repels it is the same pole, if it attracts it is the opposite pole. When you don't have a compass，the compass function of the mobile phone has the same effect.

Many applications for magnets require a matched pair for purposes of attraction. All magnets have a north polarity, and a south polarity (on the opposite side), but the poles are usually not distinguishable without some effort. Proper pole alignment is critical during assembly, as incorrect orientation will result in repulsion rather than attraction. To solve this problem Bestway Magnet stocks magnet with mark. We provide magnet with mark and support customization to facilitate your special needs.