Worth than a penny, circular magnet!
Knowledge is introduced: round magnet
Rapid progress with the development of industry, the application of circular magnet not only penetrated into each link of industry. What about some knowledge of the circular magnet must have, as you know, what is a powerful magnet!
The author to introduce the below:
Circular magnet is that there is no additional magnetic field, can keep its own magnetic an object. According to different materials can keep ten years commonly, powerful magnets are available with a ferromagnetic materials, such as iron, nickel, etc. Magnet is a general term, is refers to has the magnetic, the actual component may not contain iron. Relatively pure iron itself has no strong magnetic metallic state, only near the circular magnet magnetic induction, inside general round magnet and other impurity elements such as carbon to make magnetic stabilized, but it will reduce the electronic freedom and less prone to conduct electricity, so the current through the bulb light up, iron is a common magnetic elements, but many other elements have a stronger magnetic, like many round magnet is mixture of neodymium, iron, boron, etc.
In addition, the material need to use the circular magnet is made of high must have broad hysteresis loop, because of this, when the external magnetic field is zero, can still have relatively strong magnetization; If you want to change the magnetization into zero, will be expected to exert strong external magnetic field.