Magnets are the most common magnetic substances in our lives. We all have seen the iron stone, and also playing ironstones. We also have experiments in physical classes. Magnets are natural objects, not invented, this stone can easily suck some iron-containing substances, feel like magic, and after the early navigation, this magnet is used as a simple compass , Used to identify the direction of the sea. In fact, its students are called magnets, and their atomic structures are particularly particularly called magnetic poles. First, it itself has magnetic properties, while magnet can generate magnetic fields, which can attract ferromagnetic substances. What is ferromagnetic substance? For example, iron, when there is no magnetic field, the internal sorting of the atom is more chaotic, and the magnetic resistance offsets each other.
When it encounters iron, the internal atom is arranged neatly under the action of the magnet, and is attracted by the magnet. So, can the magnet attract all the substances? The answer is negative. For example, copper, because copper is a magnetic material, when in an environment with a magnetic field, a rejection is produced.
Also, aluminum will not be attracted by the magnet. It is a kind of paramagnetic substance, there is almost no magnetic field inside, although it will produce a certain magnetic field when encountering a magnet, but this magnetic field is very weak, it is not a million points of iron One, so it will not be attracted by the magnet. This can also explain it well why it can't use the aluminum pot on the electromagnetic furnace, so some people use an aluminum pot when cooking, and I can't wait for a meal.
Therefore, the magnet can attract a ferromagnetic material such as iron, but it can't attract a paramagnetic material such as aluminum and copper and anti-magnetic substances. See here, is you more understanding of the magnet? Of course, when the magnet exerts its role, it is also necessary to consider its shape, have a strip, and a tile shape, etc.
In fact, the frequency of magnets is utilized in life is quite high. For example, using it invented a compass, including magnetic therapy is also utilizing this principle, and is also applied to a maglev train. Therefore, magnets play its role in traditional industries, medicine and military. The world is very large, and there is a lot of substances in the inside, and each substance will last by humans. Why is the magnet only attract iron without attracting copper and aluminum? I believe that everyone will understand the principles after reading the above explanation.