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# 2 magnetism

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### 2 magnetism

1. 1. MAGNETISM
2. 2. MAGNETISM Magnetism is a class of physical phenomena that includes forces exerted by magnets on other magnets.
3. 3. MAGNETS
4. 4. 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
5. 5. A COMPASS USES A TINY MAGNET WHICH CAN SWING ROUND. 7
6. 6. 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. 8
7. 7. 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). S N Note: Some theorists believe that magnetic monopoles may have been made in the early Universe. So far, none have been detected.
8. 8. P.277  ½ crosswise Make a table showing differences of magnestism.  Magnet Ferromagnetic Material Ferrimagnetic Material Paramagnetic Material Diamagnetic Material Magnetic Characteristics Examples