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Cosa (chi) è magnet$46227$ - definizione

TYPE OF MAGNET IN WHICH THE MAGNETIC FIELD IS PRODUCED BY THE FLOW OF ELECTRIC CURRENT
Multiple coil magnet; Electromagnets; Electro-magnet; Electro magnet; Electrical magnet; Electric magnet; Energized magnet

Magnet Records         
  • Magnet Records logo
BRITISH RECORD LABEL
Magnet records
Magnet Records was a British record label, started in 1973 by Michael Levy and Peter Shelley.Adam Sweeting, "Alvin Stardust obituary", The Guardian, 23 October 2014 It was acquired by Warner Bros.
Programmable magnet         
MAGNETIC STRUCTURES INCORPORATING CORRELATED PATTERNS OF MAGNETS WITH ALTERNATING POLARITY, TO ACHIEVE A DESIRED BEHAVIOR AND DELIVER STRONGER LOCAL FORCE; BY VARYING THE MAGNETIC FIELDS AND STRENGTHS, DIFFERENT MECHANICAL BEHAVIORS CAN BE CONTROLLED
Programmable Magnets; Programmed magnets; Correlated magnet; Polymagnet
Programmed magnets, or polymagnets are magnetic structures that incorporate correlated patterns of magnets with alternating polarity, designed to achieve a desired behavior and deliver stronger local force. By varying the magnetic fields and strengths, different mechanical behaviors can be controlled.
Rare-earth magnet         
  • [[Ferrofluid]] on glass, with a rare-earth magnet underneath
PERMANENT MAGNETS MADE FROM ALLOYS OF RARE EARTH ELEMENTS
Rare earth magnet; Rare Earth magnet; Rare-Earth magnet; Rare earth permanent magnet; Rare-Earth Magnet; Rare-earth magnets; Rare-earth permanent magnet
Rare-earth magnets are strong permanent magnets made from alloys of rare-earth elements. Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.

Wikipedia

Electromagnet

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.

Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.