Electromagnetism

• Describe how to increase the strength of the magnetic field

  • Increase the current
  • Place a piece of iron in the solenoid -> iron core
  • Increasing the number of coils around the wire
• Explain how a solenoid arrangement can increase the magnetic effect of the current

  Shaping a wire to form a solenoid increases the strength of the magnetic field created by a current through the wire. The magnetic field inside a solenoid is strong and uniform. The magnetic field around a solenoid has a similar shape to that of a bar magnet. Adding an iron core increases the strength of the magnetic field of a solenoid.
• Define electromagnet

  An electromagnet is a solenoid with an iron core
• Describe how to work out the direction of the magnetic field produced by the wire

  Right hand grip rule

  Place your right hand so that the thumb is pointing in the direction of the conventional current. Now the fingers are pointing in the direction of the magnetic field.
• Define solenoid

  The coils of wire
• 2 benefits of electromagnets

  1. You can change the strength of the magnetic field by changing the size of the current.
  2. You can turn the electromagnet on and off