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Magnets that can be made easily from material found at home are called homemade magnets. These are very small and weak magnets. They are primarily for having fun and teaching children about magnetism. More »

www.reference.com Science Physics Magnetism

Naturally magnetic lodestones were found in an area of Greece called Magnesia and by the 1100s, lodestones were used for navigation. In 1269, Petus de Maricourt discovered that magnets have two poles. More »

www.reference.com Science Physics Magnetism

The Earth acts as a magnet because of electric currents generated through the movement of iron in the Earth's molten core. This motion creates a very weak magnetic force that expands from Earth reaching tens of thousands... More »

www.reference.com Science Earth Science
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To demagnetize a magnet, cause disorder to the unit magnets within the magnetic material. Strike the magnet first with a hammer, heat it strongly, and then subject it to AC current to eliminate magnetic ability completel... More »

www.reference.com Science Physics Magnetism

Permanent magnets with diminished field strength can be recharged in at least three ways: by striking, stroking or stacking. Each of these methods entails lining up the weakened magnet with a stronger external field and ... More »

www.reference.com Science Physics Magnetism

Magnetic levitation is a method of supporting an object with the repulsive force of magnets and the stability of servomechanisms. The object is thus suspended in the air, counteracting the effects of gravity. More »

www.reference.com Science Physics Magnetism

Magnets have a north and south pole, and bringing two like poles together repels magnets while unlike poles attract each other. The distance in which two magnets begin to repel or attract each other is determined by the ... More »

www.reference.com Science Physics Magnetism