Permanent and Induced Magnetism, Magnetic Forces and Fields

• What are the ends of a magnet called?

  North Pole and South Pole
• At which point of a magnet are the magnetic forces strongest?

  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
• State some metals that are magnetic

  ● Iron

  ● Cobalt

  ● Nickel

  (steel is an alloy of metal and so is also magnetic)
• What will magnetic materials be attracted to?

  The magnet, regardless of which pole is held close to it
• How would you test whether a material is magnetic or not?

  It should be brought close to a known magnet
• When is the material itself a magnet?

  If it can be repelled by the known magnet
• When is the material a magnetic material?

  If it can only be attracted and not repelled
• What are the two types of magnet?

  ● Permanent magnetics

  ● Induced magnets
• What is the difference between a permanent magnet and an induced magnet?

  ● A permanent magnet produces its own magnetic fields - it will not lose its magnetism

  ● An induced magnet becomes magnetic when placed in a magnetic field
• What happens when magnetism is induced on a material?


  ● One end of the material will become a north pole

  ● The other end will become a south pole
• What will magnetic materials always be attracted to?

  A permanent magnet
• 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 around a magnet where a non-contact force acts on another magnet or on a magnetic material
• 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
• What two main things must always be followed when drawing magnetic fields?

  ● Always go from north to south

  ● Must never touch or cross other fields
• Where is the magnetic field the strongest?

  At the poles of the magnet
• 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 - the magnetic field lines are getting further apart
• What does a magnetic compass contain?

  A small bar magnet that points in the direction of the Earth's magnetic field.
• How would you draw a magnetic field using plotting compasses?

  ● Place the plotting compass near the magnet on a piece of paper

  ● Mark the direction the compass needle points

  ● Move + place the plotting compass to many different positions in the magnetic field, marking the needle direction each time

  ● Join the points to show the field lines
• When will a uniform magnetic field be produced?


  In the gaps between opposite pole
• What is a uniform magnetic field?


  One that has the same strength and direction at all points
• How would you show a uniform magnetic field?

  ● Equal spacing between all magnetic field lines

  ● Must be an arrow on each magnetic field line going from the north pole to the south pole
• 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