3.4.14

Electromagnetism

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Electromagnets

Electromagnets are temporary magnets. Unlike permanent magnets, they can be switched on and off.

Illustrative background for Current and magnetic fieldsIllustrative background for Current and magnetic fields ?? "content

Current and magnetic fields

  • When current flows through a wire a magnetic field is also produced around it.
  • The closer to the wire you are the stronger the electromagnetic force.
  • If the current stops, the magnetic field will stop and the electromagnet will turn off.
Illustrative background for ElectromagnetsIllustrative background for Electromagnets ?? "content

Electromagnets

  • A coil of wire that generates a magnetic field is called a solenoid.
  • You are able to make electromagnets stronger by:
    • Wrapping the coils of wire around an iron core.
    • Increasing the number of turns the coil has.

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