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Magnetism - PowerPoint PPT Presentation


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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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Presentation Transcript
the nature of magnets
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
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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
the earth as a magnet
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
the sun s effect on earth
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

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Brainpop on magnetism

  • DVD on magnetism