Magnets can attract iron, nickel, cobalt and other metals, commonly known as magnets. In general, it can be divided into permanent magnets and electromagnets, which are magnetic when energized. If you hang a magnet in the shape of a rod or needle, it will naturally point to the north and south poles of the Earth. If you sprinkle iron filings on a magnet, the iron filings will show the magnetic force of the magnet. The iron filings will accumulate in this area where the force is strongest, and a lot of them will stick to the end of the magnet. Iron filings show the distribution of a magnet's attraction. Magnets at different poles attract each other; Magnets with the same poles repel each other.
Uses of magnets
Magnets are widely used. Electromagnets can act as cranes to transport steel. When the electricity is applied, the electromagnet becomes a strong magnet, so that it can hold very heavy steel. When you put down the steel, just cut off the power. Compasses are small, light and much less magnetic than large magnets. The purpose of the compass is not to attract iron, but to reflect the magnetic force of the earth. Any magnet has a North Pole and a South Pole. When N meets N and S meets S, they repel each other; When the North and South poles meet, they attract each other.
Liquid magnet
Magnets are not mysterious and are common in everyday life. However, we usually see solid magnets, but now there is a new and wonderful class of liquid magnets. Why is this a wonderful liquid magnet? This is because it is formed by mixing ferromagnetic particles of only 0.1 micron in some common liquids and making them uniformly suspended in the liquid. The performance of this liquid magnet is so good that it will not fall apart even after thousands of hours of continuous operation or under heavy load.
Function of magnet
If a few drops of liquid magnet are dropped between the shaft and the body, the direct contact between the shaft and the body can be completely eliminated, reducing friction and loss, so that the machine can work reliably for a long time. If the vacuum unit is sealed with a liquid magnet, the internal pressure can be maintained at a billionth of a millimeter of mercury. If liquid magnet oil is used in the mechanical device, the daily friction of the machine can be minimized. To achieve this, it is necessary to magnetize some of the ball bearings of the bearings. The magnetic field formed by the magnetized sphere can not only attract the ferromagnetic wave, but also cause the ferromagnetic wave to act on the friction surface. This can not only reduce friction, but also extend the service life of the bearing, and the machine will not produce noise when running.
