Magnetism

• What are the two types of magnets?

  Permanent magnets and induced magnets
• How do permanent magnets produce a magnetic field?

  They produce their own magnetic field
• What happens to induced magnets in a magnetic field?

  They turn into a magnet
• What is the nature of the force between permanent and induced magnets?

  The force is always attractive
• What happens to induced magnets when the magnetic field is removed?

  They quickly lose most or all magnetism
• What creates a magnetic field around a wire?

  Electric current flowing through the wire
• How is the magnetic field around a wire structured?

  It consists of concentric circles perpendicular to the wire
• How can you visualize the magnetic field around a current-carrying wire?

  By using a compass near the wire
• What happens to the direction of the magnetic field when the current direction changes?

  The direction of the magnetic field changes
• What rule helps determine the direction of the magnetic field?

  The right-hand thumb rule
• How do you apply the right-hand thumb rule?

  Point your thumb in the direction of current
• What do your fingers represent in the right-hand thumb rule?

  The direction of the magnetic field
• What should you remember about the hand used for the right-hand thumb rule?

  Always use your right hand
• What is the process to draw the magnetic field for a current-carrying wire?

  • Identify the direction of the current
  • Use the right-hand thumb rule
  • Draw concentric circles around the wire
  • Ensure circles are perpendicular to the wire
• What is the significance of the magnetic material becoming magnetized near a bar magnet?

  It develops its own poles and magnetic field
• How does the strength of the magnetic field change with current and distance?

  Stronger with larger current and closer distance