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Eddy currents in a solid conductor exposed to an alternating field are an instance of

  • A.Faraday's law acting within the body of the material
  • B.the displacement current in the conductor
  • C.the motional emf
  • D.Ampere's law applied to the surface of the conductor

Answer: A

The changing flux induces an electric field within the metal, and its conductivity turns that field into circulating currents that dissipate energy. Laminating the material restricts the loops available and so reduces the loss, which is why cores are built up from thin sheets.

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