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MAGNETISM
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MAGNETISM
Magnetism is a class of physical phenomena that includes forces exerted by magnets on other magnets.
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MAGNETS
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FOR EVERY NORTH, THERE IS A SOUTH
Every magnet has at least one north pole and one south pole. By convention, we say that the magnetic field lines leave the North end of a magnet and enter the South end of a magnet.
If you take a bar magnet and break it into two pieces, each piece will again have a North pole and a South pole. If you take one of those pieces and break it into two, each of the smaller pieces will have a North pole and a South pole. No matter how small the pieces of the magnet become, each piece will have a North pole and a South pole.
S N S N S N
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A COMPASS USES A TINY MAGNET
WHICH CAN SWING ROUND.
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USING A COMPASS TO FIND DIRECTIONS A compass needle always points to
the Earth’s North Pole.
Some birds use the Earth’s magnetism to find directions.
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NO MONOPOLES ALLOWED
It has not been shown to be possible to end up with a single North pole or a single South pole, which is a monopole ("mono" means one or single, thus one pole).
Note: Some theorists believe that magnetic monopoles may have been made in the early Universe. So far, none have been detected.
S N
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P.277 ½ crosswiseMake a table showing differences of
magnestism.Magnet Magnetic
CharacteristicsExamples
Ferromagnetic Material
Ferrimagnetic Material
Paramagnetic Material
Diamagnetic Material