Friday, April 15, 2011

Physics Form 5: Chapter 3 - Electromagnet

  • An electromagnet is a coil which can produce a magnetic field when a current passes through it and losses all its magnetism when the current is switched off.
  • Soft-iron is suitable to use as a core because it can be magnetized and demagnetized easily and also soft iron can concentrate the magnetic field.
  • The steel core magnet remains magnetised when the current is switched off. Therefore, steel is not suitable as the core of electromagnets. Anyway, steel is suitable to use as a bar magnet.

Click on the diagram below to play!

    The strength of a electromagnet can be increased by:
    • increasing the current flowing through the coil
    • increasing the number or turns.
    • the use of a soft iron core

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