How Magnet Works - The FORCE of Nature | A Documentary Film

A magnet is a material or object that creates an electromagnetic field. This magnetic field strength is invisible yet is liable for the most notable building of a magnet: a force that pulls on various other ferromagnetic products, such as iron, and entices or fends off other magnets.
An irreversible magnet is a things made from a material that is allured and produces its very own persistent magnetic field. Ferromagnetic (and ferrimagnetic) materials are the only ones brought in to a magnet strongly sufficient to be commonly thought about magnetic, all various other substances react weakly to a magnetic field, by one of numerous various other kinds of magnetism.
Irreversible magnets are made from "difficult" ferromagnetic products such as alnico and ferrite that are subjected to special handling in a powerful magnetic field during manufacture, to arranged their internal microcrystalline framework, making them extremely hard to demagnetize. To demagnetize a saturated magnet, a particular magnetic field has to be used, and this threshold depends on coercivity of the respective material.
When an electrical existing passes through it yet quits being a magnet when the existing quits, an electromagnet is made from a coil of cable that acts as a magnet. Often, the coil is wrapped around a core of "soft" ferromagnetic material such as steel, which greatly enhances the magnetic field created by the coil.