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Magnetism

Magnetism . The Nature of Magnets. Magnetism: force of attraction or repulsion Attraction to any substance that is, or can become, a magnet Rule of magnets: Opposite poles attract Like poles repel Magnetic fields: area surrounding the magnet that influences other objects

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Magnetism

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  1. Magnetism

  2. The Nature of Magnets • Magnetism: force of attraction or repulsion • Attraction to any substance that is, or can become, a magnet • Rule of magnets: • Opposite poles attract • Like poles repel • Magnetic fields: area surrounding the magnet that influences other objects • Poles: region of magnet where effects of magnet are strongest

  3. A single magnet

  4. Two magnets

  5. What causes magnetism? • Magnetic domains: groups of atoms lined up together • unmagnetized: groups are in random patterns • magnetized: atoms all (or mostly) line up in one direction • Magnets made of iron, cobalt, nickel • Called ferromagnetic (“ferro-” for Fe or iron-like) • Atoms can rearrange to line up in these materials

  6. Domains

  7. The Earth as a magnet • Demonstration of magnet and “lodestone” • compass always points to North • Why? • The earth itself is a magnet • strongest force is at the poles of the magnet (The North and South Pole!) • Inner core of molten iron and nickel spinning

  8. Poles switch about every 500,000 years • evidence in rock samples

  9. The Sun’s Effect on Earth • Solar wind: charged particles from the sun would destroy us if earth had no magnetic field • Cause interference for TV, Cell phones • Auroras: Northern and Southern Lights • charged particles hit atmosphere at the Poles and cause the air to glow • Video of Auroras Auroras in Finland

  10. Brainpop on magnetism • DVD on magnetism

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