P4.2 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?

  Cobalt, iron, and nickel
• Why is nickel considered a magnetic material but not always a magnet?

  Only some pieces of nickel are magnets
• What acronym can help remember common magnetic elements?

  NCIS
• What are permanent magnets?

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

  Magnets that have a magnetic field temporarily
• How is an induced magnet created?

  By placing a magnetic material in a magnetic field
• 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 are the key differences between permanent and induced magnets?

  
  

  Permanent magnets:

  • Produce their own magnetic field
  • Always magnetic

  Induced magnets:

  • Have a magnetic field temporarily
  • Created in the presence of a permanent magnet
• What is the relationship between permanent and induced magnets?

  • The force between them is always attractive
  • Induced magnets develop their own north and south poles
• What is a magnetic material?


  A magnetic material is any material or object that can be influenced by a magnetic field, and has the potential to become a magnet.
• Which 4 metals are magnetic?


  Nickel.

  Cobalt.

  Iron.

  Steel.
• What is the difference between a permanent and an induced magnet?

  Permanent magnets : always produce their own magnetic field

  Induced magnets : (also known as 'temporary magnets') only produce a magnetic field in the presence of another magnet.
• How do you make an induced magnet?


  Place a magnetic material into a magnetic field, this will induce it to temporarily have its own magnetic field.
• Is the magnetic force between an induced magnet and a permanent magnet that created it attractive or repulsive?


  It will always be attractive.
• What is the difference between a magnetically soft and a magnetically hard material?

  Magnetic materials that gain and lose magnetism quickly are called magnetically soft materials.

  Magnetic materials that gain and lose magnetism slowly are called magnetically hard materials.
• Is iron magnetically soft or hard?


  Iron is magnetically soft.

  It gains and loses it's magnetism slowly.
• Is steel magnetically soft or hard?


  Steel is magnetically hard.

  It gains and loses its magnetism quickly.