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Magnetic units that? Present how strong the strongest magnetic force?

Magnetic units are gauss (GAUSS), but should note that there are two kinds of meaning, including: one is the residual material flux density (Br), Nd-52 is a maximum of up to 14,800 gauss. Another magnet is made later by Gauss meter (Table) to measure the magnetic surface, the current level of use made of the most magnetic materials by measuring the surface has a 8,000 gauss magnetic strength, magnetic intensity refers to the general that the latter run.

Magnets can be unipolar exist? Can be multi-polar magnetized it?

1, magnetic monopole can not exist, the public did the so-called "unipolar" refers to the use of which use only the S pole or N pole it is not only a magnet and a very sinking, there is meaning.
2, can be multi-polar magnetization, and if too large or functional require a multi-polar, then the charge on the 100 most all of the above is not a problem, the company has a very magnetic pole ring magnet with 128.

How does a magnet made of? Magnetic disappear after long use it?

1, according to the different materials, different forming methods, such as ferrite powder metallurgy method is used, aluminum nickel and cobalt are two kinds of casting and powder metallurgy; samarium cobalt, neodymium iron boron powder metallurgy are used. Injection molding plastic is; rubber is rolling and extrusion using two.
2, according to different uses, the speed of magnetic force by magnetic vary. Of course, also reduce the magnetic speed magnetic material itself is closely related to security, some designs use 10, some 20 years even if no obvious decay, basically a magnet and iron if shared, the formation of magnetic loops are more difficult to reduce the magnetic.