Physics - permanent and induced magnets

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  • Permanent and Induced Magnets
    • Permanent
      • They produce their own magnetic field.
      • The force between a P and I magnet is always attractive
        • Induced
          • Magnetic materials that turn into a magnet when put in a magnetic field.
          • When you take away the magnetic field, I magnets lose their magnetism quickly & stop producing a magnetic field.
    • Induced
      • Magnetic materials that turn into a magnet when put in a magnetic field.
      • When you take away the magnetic field, I magnets lose their magnetism quickly & stop producing a magnetic field.
    • Magnets produce magnetic field
      • Magnetic field drawings - lines always go fro, north to south. The closer together the lines are, the stronger the magnetic field.
      • Magnetic field is strongest at the poles.
      • Same poles will repel and opposite poles will attract.
    • Compasses
      • Inside is a tiny bar magnet. The north of this is attracted to the south of any other magnet - so the compass points in the direction of the magnetic field its in.
      • When they're not near a magnet, they always point north because the Earth generates its own magnetic field.

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