*investigating electromagnets

• Materials needed to make an electromagnet

  • a coil of wire
  • a magnetic core inside the coil
  • an electric current flowing in the coil
• Factors that affect the strength of an electromagnet

  • the more turns in the coil, the stronger
  • the material (iron and some types of steel make the strongest)
  • the greater the current in the coil, the stronger
• Soft iron


  iron that is easily magnetised and easily demagnetised
• Demagnetised


  has lost its magnetism