Magnetic induction

  • Any change in the magnetic flux passing through a loop of wire will cause an EMF to be induced in the loop
  • The EMF produces a current
  • The current in the loop has its own magnetic field
  • The induced magnetic field opposes any changes to flux, but cannot oppose the change fully

Lenz’s law

If the magnetic flux through a loop changes,

  • A current will be induced in the loop
  • The current produces a magnetic flux that opposes the original change

Very similar to inertia

  • If the flux increases, the loop will produce a flux that tries to decrease the flux.
  • If the flux decreases, the loop produces a flux that tries to increase the flux
  • If the north pole of a magnet is moved towards the loop, it will produce a north pole to oppose the magnet
  • If the north pole is moved away from the loop, it will produceĀ  south pole to oppose the magnet’s motion
  • Similar principles apply for a south pole

Electromagnetic induction

  • The induced current is directly proportional to the rate of change of flux
  • The faster the rate of change, the greater the current
  • The creation of an electric current due to changes in a magnetic field is called electromagnetic induction
  • The conductor carrying the induced current is called an inductor

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