One example of a magnet is a refrigerator magnet. These are also called permanent magnets because they always retain a certain degree of their magnetism. There some other general categories for magnets, such as temporary magnets and electromagnets.Know More
Temporary magnets are objects that will act like permanent magnets when they are in a strong magnetic field. Many household objects are temporary magnets, such as paperclips, staples and other related objects.
Electromagnets are magnets that use electrical power to create very powerful magnetic fields. Electromagnetism actually is the technology that allows computers and televisions to work, according to How Magnets Work, a reference site on magnet science topics. Electromagnets work by having a metal core, usually iron, surrounded by a coil of wire. The wire carries a current, which creates the magnetic field. When the current is turned off, however, the apparatus is demagnetized.Learn more about Magnetism
A nail that is used in an electricity experiment with wire coiled around it is an example of a temporary magnet. When the electrical current is on, it acts as a magnet, but when it's off, it is no longer magnetic.Full Answer >
The magnetic field of a permanent magnetic material destabilizes on its own over a long period of time, generally on the order of hundreds of years. Magnets, however, weaken more quickly when they are exposed to physical shocks, other magnetic or electrical fields, and high temperatures.Full Answer >
Magnets are used in computer data storage, compasses, doorbells and alarm systems, microphones and speakers, motors, electrical generators and electrical transformers. They are also used to levitate objects, including trains that operate via magnetic propulsion. Naturally occurring magnetism protects the Earth from cosmic radiation.Full Answer >
Magnets have been known since antiquity and occur naturally through a mineral known as magnetite. Magnetite is an iron oxide and contains a high concentration of iron, which magnetizes when it forms. This mineral is also known as lodestone.Full Answer >