permanent and induced magnetism, magnetic forces and fields

• What is the strongest part of a magnet?

  The poles of the magnet.
• What happens when two magnets are brought close to each other?


  They exert a force on each other.
• What type of force is exerted if two like poles of a magnet are brought near each other?


  A repulsive, non-contact force.
• What type of force is exerted if two unlike poles of a magnet are brought near each other?


  An attractive, non-contact force.
• What is the difference between a permanent magnet and an induced magnet?


  • A permanent magnet produces its own magnetic field.
  • An induced magnet becomes magnetic when placed in a magnetic field.
• What type of force does induced magnetism always cause?


  A force of attraction.
• What happens when an induced magnet is removed from a magnetic field?


  The induced magnet loses most/all of its magnetism.
• What is a magnetic field?


  The region surrounding a magnet where another magnet or magnetic material experiences a non-contact force.
• Give four examples of magnetic materials.


  1. Iron
  2. Steel
  3. Cobalt
  4. Nickel
• What can always be said about the force between a magnet and a magnetic material?


  It is always attractive.
• How does the strength of a magnetic field alter as you move further away from the magnet producing it?


  The magnetic field strength decreases the further you move away.
• In what direction does a magnetic field point?


  • In the direction that a north pole would experience a force if placed in the field.
  • From the north seeking pole to the south seeking pole of a magnet.
• What does a magnetic compass contain?


  A small bar magnet that points in the direction of the Earth’s magnetic field.