#electromagnet  a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet
  supertype:  #magnet  a device that attracts iron and produces a magnetic field
  subtype:  #magnetic_head  an electromagnet (as on a tape recorder) that converts electrical variations into magnetic variations that can be stored on a surface a later retrieved
  part of:  #electric_bell  #electrical_relay
  part:  #armature  coil in which voltage is induced by motion through a magnetic field

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