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An induction furnace heats a conducting workpiece by

  • A.the displacement current in the surrounding air
  • B.driving eddy currents in it with an alternating field
  • C.conducting a heavy current through it directly
  • D.hysteresis loss alone

Answer: B

A coil carrying alternating current induces currents within the workpiece, which dissipate in its resistance. The frequency is chosen so that the skin depth suits the depth of heating wanted, high frequency for surface hardening and low for through heating.

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