Magnets & Magnetism
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Any material that produces a magnetic field is a magnet. A magnetic field is generally invisible but is responsible for the most notable property of a magnetic, force. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. Everyday objects like refrigerator magnets are used to hold notes on refrigerator doors. Materials that can be magnetized are also the ones that are strongly attracted to magnets these include iron, nickel and cobalt.