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Rev. Notes > IGCSE > Simple phenomenon of magnetism
Previous Topic Simple phenomenon of magnetism Next Topic

Properties of magnets Basic cause of magnetism Properties of magnetic lines of forces
Ferus and non-ferus materials Methods of magnetisations Methods of demagnetisations
Experiment - pattern of magnetic lines of forces arround a bar magnet Properties of magnetic lines of forces Magnetic properties of iron and steel
Design and use of permanent and electromagnets

Design and use of permanent and electromagnets

Design of electromagnet


  • A large iron nail (about 3 inches)
  • About three feet of copper wire (Thin coated)
  • Battery


  • Leave about 8 inches of wire loose at one end and wrap most of the rest of the wire around the nail. Try not to overlap the wires.
  • Cut the wire so that you are gettin 8 inches loose at the other end.
  • Now make the connection of the two ends of the wire with the two terminals (positive and negative)  of the battery.
  • Your electromagnet is ready.
  • Bring some clips near the nail, they will be attracted towards it.
  • Do not keep the connection for long time (battery may get warm). Just disconnect it after exploring the fact.



Uses of electromagnet

1- Magnetic Media

  • Magnetic media such as VHS tapes, hard drives and audio cassettes use a thin coating of magnetic material to record information. The reading device uses magnets to decode this information.

2- Cathode Ray Tubes

  • Devices such as televisions and monitors can contain a cathode ray tube (CRT). A CRT uses electromagnets to direct the flow of electrons to the screen.

3- Speakers

  • Speakers generally use a permanent magnet to convert an electrical signal into a physical movement that produces sound.

4- Magnetic Levitation

  • Magnetic levitation (MAGLEV) trains use many powerful electromagnets to lift the train about 15 mm above the tracks. This eliminates the friction between the train and the track.

5- Industrial Lifting

  • Large electromagnets are commonly used to move large metal objects such as crushed cars in a junkyard.





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