magnetism - which is where the magnetic effect is strongest...

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Note-A-Rific: Magnetism Today it is clear that magnetism and electricity are closely related. This relationship was not discovered until the nineteenth century. The history of magnetism begins much earlier with the ancient civilizations in Asia Minor o In a region known as Magnesia rocks were found that would attract each other. o These rocks were called "magnets". For a long time magnets were just viewed as a novelty… they weren’t used for anything serious. Eventually it was discovered that a magnet suspended from a fine thread will spin until one pole (end) of the magnet is pointing toward the north. The pole which points north is called the north pole; the other pole, pointing south, is called the south pole. It is not known for sure when this was discovered, but the Chinese were making use of simple compasses by the eleventh century. A magnet will attract paper clips, nails, and other objects made of iron. Any magnet (in the shape of a bar or a horseshoe, etc.) has two ends called poles,
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Unformatted text preview: which is where the magnetic effect is strongest. • As magnets are brought near one another, each exerts a force on the other. • The force can be either attractive or repulsive and can be felt even when the magnets don't touch (force at a distance). o Like poles repel and unlike poles attract. ! North repels north, south repels south, but north attracts south • This is like the force between electric charges. o Do not confuse magnet poles with electric charge… they are not the same thing. Only iron and a few other materials such as cobalt , nickel , and gadolinium show strong magnetic effects. • These four metals are said to be ferromagnetic (from Latin word “ferrum” meaning iron). • Contrary to popular belief, most metals have very little magnetism. o Other metals show some slight magnetic effect, but it is extremely small and very difficult to measure....
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