Magnetic fields

• What is meant by a magnetic field?

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

  Using a compass to trace field lines
• What evidence supports 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?

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

  It decreases as 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
• What is the process of plotting a magnetic field using a compass?

  Place compass, mark, and connect points
• What does it indicate when magnetic field lines are closer together?

  The magnetic field is strongest there
• What does the compass needle indicate when held away from magnets?

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

  Due to the Earth's core
• What happens to a piece of iron placed in a magnetic field?

  It becomes an induced magnet
• How does the magnetic field of the Earth compare to that of a bar magnet?

  Both have north and south poles