Magnetic field

• What is meant by a magnetic field?

  A region around a magnet where force acts
• How can you plot the magnetic field pattern of a magnet?

  By using a compass to trace field lines
• What evidence suggests that the Earth's core is magnetic?

  The compass needle points north-south
• What are the two types of magnets mentioned?

  Permanent and induced magnets
• What is a permanent magnet?

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

  A material that becomes a magnet in a field
• What are the four types of magnetic materials?

  Iron, steel, cobalt, and nickel
• How does the strength of a magnetic field change with distance?

  It decreases as the distance increases
• Where is the magnetic field strongest in a magnet?

  At the poles of the magnet
• How can you find the direction of a magnetic field?

  Using a magnetic compass
• What happens when you place a magnetic material in a magnetic field?

  It experiences a force of attraction
• How do you plot a complete magnetic field line using a compass?

  Draw crosses at the compass's North Pole repeatedly
• What does it indicate when magnetic field lines are closer together?

  The magnetic field is strongest in that area
• What does a magnetic compass contain?

  A small bar magnet
• What does the Earth's magnetic field cause a compass needle to do?

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

  It is due to the Earth's core
• Where can you find questions on magnetic fields related to this lesson?

  In the vision workbook