Electro magnets

• What can magnets do to each other?

  Attract and repel
• What are the two poles of a magnet?

  North and south pole
• What happens when two unlike poles of magnets are brought together?

  They attract each other
• What happens when two like poles of magnets are brought together?

  They repel each other
• What is the force that causes magnets to attract and repel?

  Magnetism
• What type of force is magnetism?

  Non-contact force
• What direction do magnetic field lines run?

  From north to south
• What happens to magnetic field lines running in opposite directions?

  They repel
• What happens to magnetic field lines running in the same direction?

  They attract
• What is Earth described as in terms of magnetism?

  A giant magnet
• How do you use a compass at the South Pole?

  Follow where it points
• What happens when an electric current flows through a wire?

  It creates a magnetic field
• How strong is the magnetic field around a wire with current?

  Very weak
• How do you make an electromagnet?

  • Wrap a wire around an iron nail
  • The iron nail is the iron core
  • The wraps are called coils
  • Coils increase the strength of the magnetic field
• What can increase the strength of an electromagnet?

  Increase the current of the cell
• How can you increase the strength of an electromagnet's magnetic field?


  Increase the number of coils
• What are the key components of an electromagnet?

  • Wire
  • Iron nail (iron core)
  • Coils around the core
  • Electric current flowing through the wire