Why can't magnets attract copper

In today's increasingly wide range of magnet applications, why can't magnets attract copper? First of all, magnetic fields have an effect on all metal pairs,

without exception. But there are three situations. Metals are divided into three types: paramagnets, diamagnetics, and ferromagnets.

1. Paramagnets: can be slightly attracted by magnets.

2. Diamagnetics: can be slightly repelled by magnets.

3. Ferromagnetics: can be strongly attracted by magnets.

There are only three types of ferromagnets: iron, cobalt, and nickel. The rest are either paramagnets or diamagnetics.

There are also their alloys, whose magnetic properties are close to ferromagnets in varying degrees.

Nickel-containing stainless steel can be (strongly) attracted by permanent magnets.

Nickel-free stainless steel (usually containing chromium) reacts weakly to this iron and is not easily detected. The latter has a higher hardness because it contains chromium. The former is what is commonly called stainless iron.

Suspend aluminum and copper with a long thin wire and keep them still without swinging. Use a magnet to slowly approach aluminum or copper horizontally, and you will find that they will be slightly attracted or repelled.

So they are paramagnets and antimagnets respectively. If the magnet is made into a rod or needle shape and hung up, it will naturally point to the South Pole and the North Pole of the earth.

Magnets are divided into large magnets and small magnets. Large magnets are widely used, such as electromagnets, which are made into cranes for transporting steel. After being powered on, they become magnets with strong magnetic properties,

so they can attract heavy steel. When putting down the steel, just cut off the power supply. Small magnets Compared with large magnets, the compass is small and light, and its magnetic properties are also much weaker. The function of the compass is not to attract iron, but to reflect the magnetic force of the earth. The property of magnets to attract materials such as iron, cobalt, and nickel is called magnetism.

The areas with strong magnetic properties at both ends of the magnet are called magnetic poles, one end is the North Pole (N pole) and the other end is the South Pole (S pole). Experiments have shown that like poles repel each other and opposite poles attract each other. There are many primary magnets with two opposite poles in iron. When there is no external magnetic field, these primary magnets are arranged in disorder, their magnetism cancels each other out, and they do not show magnetism to the outside. When iron is brought close to a magnet, these original magnets are neatly arranged under the action of the magnet, so that the end close to the magnet has a polarity opposite to that of the magnet and attracts each other.

This shows that iron can be magnetized by rare earth magnet or other permanent magnets due to the existence of the original magnet. However, metals such as copper and aluminum do not have the original magnetic structure, so they cannot be attracted by the magnet.