magneetta

Magneetta is the Finnish word for magnet. In science, a magnet is an object that produces a magnetic field, which can attract ferromagnetic materials such as iron and nickel and can exert forces on other magnets.

Magnets come in two main forms: permanent magnets that retain magnetization and electromagnets that generate a magnetic field only when electric current flows. Common permanent-magnet materials include ferrites (ceramic magnets), alnico, and rare-earth magnets such as neodymium-iron-boron and samarium-cobalt.

Polarity is defined by two poles, north and south; like poles repel and opposite poles attract. Electromagnets consist of a coil of wire and a ferromagnetic core; strength depends on current, number of turns, and core material.

Applications of magnets span many technologies. They are used in electric motors and generators, transformers, loudspeakers, magnetic memory devices, MRI machines, magnetic separators, and a variety of everyday devices that rely on magnetic forces or fields.

History traces back to lodestone, known in ancient times; the term magnet derives from Magnesia. In the 19th century, scientists such as Oersted and Faraday advanced understanding of magnetic fields and electromagnetic induction, leading to widespread technological use of magnets.

Magneetta thus underpins a wide range of technologies by providing non-contact forces, energy storage, and controllable magnetic fields.