Magnet: Difference between revisions
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File:Magnetite_sample_with_neodymium_magnet.jpg|Magnetite sample with neodymium magnet | |||
File:Magnet0873.png|Magnet | |||
File:Magnet_bar.ogv|Magnet bar | |||
File:VFPt_cylindrical_magnet_thumb.svg|Cylindrical magnet | |||
File:Hard_disk.jpg|Hard disk | |||
File:Magnetic_separator_hg.jpg|Magnetic separator | |||
File:M_tic.jpg|Magnet | |||
File:Ceramic_magnets.jpg|Ceramic magnets | |||
File:The_Effects_of_Magnetism.JPG|The effects of magnetism | |||
File:VFPt_four_magnets.svg|Four magnets | |||
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Latest revision as of 11:29, 18 February 2025
Magnet
A magnet 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, such as iron, and attracts or repels other magnets.
Physical properties[edit]
A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An example is lodestone. 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.
Magnetic field[edit]
The magnetic field produced by a magnet is proportional to the magnet's size and strength. The magnetic field is the area around a magnet in which there is magnetic force. Moving electric charges can make magnetic fields.
Types of magnets[edit]
There are several types of magnets, each with their own properties and uses. These include:
- Permanent magnets: These are the common types of magnets that people are familiar with. They have a persistent magnetic field and attract certain types of metals.
- Electromagnets: These are magnets that only produce a magnetic field when an electric current is applied to them. They are used in a wide range of applications, from large magnets used in scrap yards to pick up cars, to small electromagnets used in electronic equipment.
- Superconducting magnets: These are made from superconducting wire and can produce very strong magnetic fields. They are used in applications such as MRI machines and particle accelerators.
Uses of magnets[edit]
Magnets have many uses in our daily lives. They are used in a wide range of devices including simple toys, computers, credit cards, MRI machines and business equipment. Magnets are also used to produce electricity in power plants.
