Permanent magnet definition is - a magnet that retains its magnetism after removal of the magnetizing force. Permanent magnet definition, a magnet that retains its magnetism after being removed from an external magnetic field. See more.
A permanent magnet is a magnet that is permanent, in contrast to an electromagnetwhich only behaves like a magnet when an electric current is flowing through it. Permanent magnets are made out of substances like magnetite Fe 3 O 4the most magnetic naturally occurring mineral, or neodymiuma powerfully magnetic synthetic what computer is good for gaming and cheap. The Earth itself is a huge permanent magnet, though its magnetic field is quite weak relative to its size.
Humans have used the magnetic field of the Earth for navigation since the compass was invented in ancient China. Even the most powerful permanent magnet permanwnt not as strong as the stronger electromagnets, so their applications are limited, but they still have many uses. The most mundane would be use as refrigerator magnets, but magnets can be found everywhere, including your hard disk, ATM what is the definition of a permanent magnet credit cards, speakers and microphones, electric motors, and toys.
Electric motors work through an interaction between an electromagnet definotion a permanent magnet. Every permanent magnet generates a magnetic field, just like any other magnet, which thee around the magnet is a distinct pattern. The size of the magnetic field is related to the size of the magnet and its strength. The easiest way to view magnte magnetic field generated by a permanent magnet is to scatter iron filings around a bar magnetwhich dfinition orient themselves along the field lines.
Every permanent magnet has definitoin poles, named north and south, though they could have just as easily been called A and B. Similar poles repel while opposite poles attract. It takes a lot of effort to hold repelling poles of a permanfnt together, while it takes effort to remove attracting poles.
The most powerful magnets attract so hard that they can cause injuries by pinching skin between them. For thousands of years, permanent magnets were the only magnets that humans had. The electromagnet was only invented in Before that, thd were mostly novelties. Using an electromagnet, it is possible to induce a current in any ferromagnetic materials, such as an iron paperclip. The effect quickly fades, however.
Permanent magnets can be a nuisance by threatening to erase data from ATM cards or computer hard teh. A common way of erasing data from a computer hard drive and making sure it is irrecoverable is to run a magnet over it. Otherwise, "deleted" files actually remain on a computer, just hidden.
This is because definiiton is more work to have the computer actually delete the data. Rather, the data is designated as a sector of the hard drive that can be written over without concern. Michael is a longtime wiseGEEK contributor who specializes in topics relating to paleontology, physics, biology, astronomy, chemistry, and futurism. In addition to being an avid blogger, Michael is particularly passionate about stem cell research, regenerative medicine, and life extension therapies.
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permanent magnet - a magnet that retains its magnetism after being removed from a magnetic field static magnet magnet - (physics) a device that attracts iron and produces a magnetic field. Mar 19, · Permanent magnets are materials where the magnetic field is generated by the internal structure of the material itself. Inside atoms and crystals you have both electrons and the nucleus of the atom. Both the nucleus and the electrons themselves act like little magnets, like little spinning chunks of electric charge, and they have magnetic fields inherent in the particles themselves. permanent magnet An MRI term for a magnet design that uses blocks of ferromagnetic materials (permanent magnets) to generate a magnetic field between the magnet’s poles. Pros No need for extra electrical power or cooling, reduced fringe field effect .
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