magnetic fields

• What should you be able to describe by the end of the video on magnetic fields?

  Magnetic fields, how to plot their patterns, and evidence of Earth's core magnetism
• What is a permanent magnet?

  A permanent magnet always has a magnetic field
• What is an induced magnet?

  An induced magnet becomes a magnet when placed in a magnetic field
• What are the four types of magnetic materials?

  • Iron
  • Steel (an alloy of iron)
  • Cobalt
  • Nickel
• What is a magnetic field?

  A magnetic field is a region around a magnet where a force acts on another magnet or magnetic material
• What happens when a magnetic material like iron is placed in a magnetic field?

  It experiences a force of attraction towards the magnet
• How does the strength of a magnetic field change with distance from the magnet?

  The strength decreases as the distance from the magnet increases
• Where is the magnetic field strongest in a magnet?

  At the poles of the magnet
• How can the direction of a magnetic field be found?

  Using a magnetic compass
• What do you do to plot the magnetic field pattern of a bar magnet using a compass?

  Place the compass near the magnet and draw crosses at the North Pole of the compass
• What does it mean when the lines of a magnetic field are closer together?

  It indicates that the magnetic field is strongest in that area
• What does a magnetic compass contain?

  A small bar magnet
• What does the needle of a compass point to when held away from any magnets?

  It points in the north-south direction
• What is the reason for the Earth's magnetic field?

  It is due to the Earth's core
• What can you find plenty of questions on magnetic fields in?

  In the vision workbook