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A magnet (from Greek μαγνήτις λίθος magnḗtis líthos, Magnesian stone) is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials like iron and attracts or repels other magnets. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism. Ferromagnetic materials can be divided into magnetically "soft" materials like annealed iron which can be magnetized but don't tend to stay magnetized, and magnetically "hard" materials, which do. Permanent magnets are made from "hard" ferromagnetic materials which are subjected to special processing in a powerful magnetic field during manufacture, to align their internal microcrystalline structure, making them very hard to demagnetize. To demagnetize a saturated magnet, a certain magnetic field must be applied and this threshold depends on coercivity of the respective material. "Hard" materials have high coercivity whereas "soft" materials have low coercivity. An electromagnet is made from a coil of wire which acts as a magnet when an electric current passes through it, but stops being a magnet when the current stops. Often an electromagnet is wrapped around a core of ferromagnetic material like steel, which enhances the magnetic field produced by the coil. The overall strength of a magnet is measured by its magnetic moment, while the local strength of the magnetism in a material is measured by its magnetization. From Wikipedia under the
GNU Free Documentation License Is it safe to put fridge magnets on a boiler? Q. I have a boiler in my room, and i've put put fridge magnets on it to make it look a bit more cool. But i dont if it is safe or if it will set fire. Asked by leodude123456 - Tue Aug 14 06:23:11 2007 - - 4 Answers - 0 Comments A. i take it you have a radiator , not a Boiler, in your room, the part that allows hot water to flow thru it to heat your room ? if this is true then magnets will not do any harm, Answered by William B - Fri Aug 17 19:04:09 2007 Why are there magnets in a pair of tennis shoes? Q. My mom bought a pair of tennis shoes in Brazil. They have little magnets in the sole of the shoe- one in each heal then a few spread along the rest of the sole. What is the purpose of this? Thanks. Asked by Shorty - Sat Jul 18 10:14:05 2009 - - 1 Answers - 0 Comments A. The only thing I can think of is that some believe that magnets are beneficial. If you do a search on magnetic therapy, you'll find thousands of links to sites trying to sell you on the idea (and one of their products). Answered by Robert W - Sun Jul 19 12:23:50 2009 Do you think that electrically charged objects behave the same way as two magnets?
Q. Do you think that electrically charged objects behave the same way as two magnets, or do you think they behave differently? Why do you think so? Asked by The Motherload - Tue Jan 29 21:07:29 2008 - - 2 Answers - 0 Comments A. Forces between individual charges follow an inverse square law, Coulomb's Law. Magnetic fields are seldom that simple, especially since there is no known magnetic monopole. Answered by Frank N - Tue Jan 29 23:05:09 2008 From Yahoo Answer Search: "Magnets" See also:
 news.google.com Fri, 02 Jul 2010 17:36:29 GMT+00:00 WLWT Cincinnati Authorities said Fernand Lee Allart, who worked at Tri-State Livestock, attached magnets on scales to reduce weights of cattle. ... Ohio Man Charged With Tipping Cow Scales CattleNetwork.com news.google.com Sat, 19 Jun 2010 01:28:09 GMT+00:00 G4 TV (blog) Pop a shot at anything, and it attaches a magnet to it. Fire a second shot at anything, and a second magnet gets attached to that. And what do magnets do? ... news.google.com Fri, 02 Jul 2010 00:09:53 GMT+00:00 New America Media Add to that flexibility a strict accounting system for business owners, who create jobs magnets by flouting immigration law, he said. ... From Google News Search: "Magnets"  indigo.com 480px x 640px | 16.30kB [source page] yeah same here wtf are portholes As far as I can tell They are magnets That are fake  libellulobar.com 462px x 446px | 89.80kB [source page] Classe sous Libellulobar | 12 Commentaires From Yahoo Image Search: "Magnets"  cieza-golf.com Jacobs Fri, 23 Jul 2010 13:37:26 GM Refrigerator . magnets. are best choice for gift because they are very easy to make, and they also have fun to make. Gift receiving people also have pleasant experience because they can also customize their gift according to their style ...  power-shift.org admin ue, 27 Jul 2010 04:03:37 GM How would you like to create a generator which creates free electric energy? Using our easy-to-follow guide, you will be able create.  scienceblog.com bjs hu, 08 Jul 2010 17:31:05 GM Metallic carbon nanotubes show great promise for applications from microelectronics to power lines because of their ballistic transmission of electrons. But who knew . magnets. could stop those electrons in their tracks? From Google Blog Search: "Magnets" |
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