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Eddy current

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Eddy currents are electric currents induced in electrically conducting materials by fluctuating magnetic fields. An eddy current is caused when a moving (or changing) magnetic field intersects a conductor, or vice-versa. The relative motion causes a circulating flow of electrons, or current, within the conductor. These circulating eddies of current create electromagnets with magnetic fields that oppose the effect of the applied magnetic field.[1]

In effect, an eddy current absorbs kinetic energy, causing a conductor (such as a large plate of copper) to stop when it is swung through a magnetic field. Eddy currents are sometimes used as braking technology.[2]

References

  1. http://www.indikon.com/terminology.php
  2. http://www.physlink.com/education/askexperts/ae527.cfm
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