Permanent & Induced Magnets

• What is a magnetic material?

  Any object influenced by a magnetic field
• What distinguishes an actual magnet from a magnetic material?

  An actual magnet produces a magnetic field
• Which elements are commonly known as magnetic materials?

  Nickel, cobalt, and iron
• Why is nickel not always a magnet?

  Only some pieces of nickel are magnets
• What do the first letters of nickel, cobalt, iron, and steel spell?

  NCIS
• What are permanent magnets?

  Magnets that produce their own magnetic field
• What are induced magnets?

  Magnets that have a magnetic field temporarily
• How does a piece of magnetic material become an induced magnet?

  By being placed in the field of a permanent magnet
• What happens to an induced magnet when removed from a magnetic field?

  It loses its magnetism
• What are magnetically soft materials?

  Materials that lose magnetism quickly
• What are magnetically hard materials?

  Materials that lose magnetism slowly
• What is the difference between permanent and induced magnets?

  • Permanent magnets:
  • Produce their own magnetic field constantly
  • Induced magnets:
  • Have a magnetic field only temporarily
• What is the relationship between permanent and induced magnets?

  • The force between them is always attractive
  • Induced magnets develop their own poles