8.2 Magnetic Fields

• What is a magnetic field?

  Region around a magnet where force acts
• How do you plot the magnetic field pattern of a magnet?

  Using a compass to draw field lines
• What are the two types of magnets mentioned?

  Permanent and induced magnets
• What is a permanent magnet?

  Always has a magnetic field
• What is an induced magnet?

  Becomes a magnet in a magnetic field
• What are the four types of magnetic materials?

  Iron, steel, cobalt, nickel
• What happens when a magnetic material is placed in a magnetic field?

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

  It decreases as distance from the magnet 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 does a compass needle indicate when placed near a bar magnet?

  The direction of the magnetic field
• How do you plot a complete magnetic field line using a compass?

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

  It indicates a stronger magnetic field
• What causes the Earth's magnetic field?

  The Earth's core
• What does the Earth's magnetic field indicate?

  That the Earth has its own magnetic field
• What does a magnetic compass contain?

  A small bar magnet
• What happens to a compass needle when held away from magnets?

  It points in the north-south direction