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Magnets marketed for pain relief usually claim strengths of 300 to 5,000 Gâmany times stronger than the Earthâs magnetic field (about 0.5 G) but much weaker than the magnets used for MRI machines (approximately 15,000 G or higher).
However most people donât really understand what are magnets made of and how they even work. The issue is that we just know that magnets attract iron and nickel. However, magnets have a very interesting origin and can be seen as a physical manifestation of the electromagnetic force. All magnets are made of a group of metals called the ferromagnetic metals. These are metals such as nickel and iron. Each of these metals have the special property of being able to be magnetized uniformly. When we ask how a magnet works we are simply asking how the object we call a magnet exerts itâs magnetic field.