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

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 »

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

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 »

You can build a magnetic motor by utilizing a cylinder on a rotor and several magnets. By capitalizing on the repellent forces of magnetic poles, it is possible to create a machine in constant motion with the capabilitie... More »

www.reference.com Science Physics Magnetism

In addition to the simple magnets on the refrigerator that hold up photos, coupons or shopping lists, magnets (often electromagnets) are also found in virtually any electric device or appliance with a motor, transformer,... More »

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 »