2014年6月30日星期一

The properties of a magnet and how many?

   The invention of the magnet is not human, natural magnetite, was first discovered and used magnets should be Chinese. So the "compass" is one of the four great inventions of Chinese. As for the component that is iron,cobalt, nickel and so on. The special structure of the atom, the atom itselfhas a magnetic moment. The mineral molecules arranged the general confusion. Magnetic regions influence each other cannot appear themagnetic.. but in the external
bullet magnetguided molecular orientationconsistency. It shows magnetic. Also known as magnet. Iron cobalt nickel isthe most commonly used magnetic material basically consists of permanent magnet and the soft magnet permanent magnet is coupled with strong magnetic to magnetic material and electronic spin angular momentum in a fixed direction of soft magnetic is coupled with the current (also a method coupled with magnetic) current to remove iron will slowly lose magnetism as for the first magnet who found the most ancient records is Chinese Huangdiwar Chi You's Guide to the so called one of the four great inventions ofChina! China namely know magnet polarized in the first Century b.c.. In the Warring States period, had used a natural magnet, on a scale of copper,used in divination. Using two methods to produce artificial magnets in the Song Dynasty, one kind is burning iron needle red, in the north-south direction, rapid cooling, use the earth's magnetic field will iron needlemagnetization; another is the use of magnet iron needle and friction."Dream" recorded in the existence of magnetic declination, found in themagnetic needle points to the south, under the influence, than the real South east. Based on these knowledge, and develop a magnet for scientificapplication of the compass. Magnet is a generic term, refers to a magneticthings, the actual component does not necessarily contain iron. Compared with the pure metal state of iron itself has no permanent magnetism, onlyclose to the permanent magnet can induce magnetic, professionalproduction Nantian magnet, permanent magnet in general with other impurity elements holding magnets
 to make the
 magnetic stabilized, but it will make the electronic freedom is decreased without conductive, so when the current through the light bulb is not up. Iron is a common magnetic elements, but many other elements have a stronger magnetic, like many powerful magnetNdFeB is mixed.