#magnet  a device that attracts iron and produces a magnetic field
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  part:  core.bar  magnetic_pole.end
  subtype:  bar_magnet__barmagnet  a magnet in the form of a bar with magnetic poles at each end
  subtype:  electromagnet  a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet
     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
  subtype:  field_magnet__fieldmagnet  a magnet that provides a magnetic field in a dynamo or electric motor
  subtype:  magnetic_needle  a slender magnet suspended in a magnetic compass on a mounting with little friction; used to indicate the direction of the earth's magnetic pole
  subtype:  paramagnet  magnet made of a substance whose magnetization is proportional to the strength of the magnetic field applied to it
  subtype:  permanent_magnet__permanentmagnet__static_magnet  a magnet that retains its magnetism after being removed from a magnetic field
     subtype:  stud_finder  a small permanent magnet in a metal container; when the magnet clicks against the container it indicates that the magnet is directly over an iron nail that holds the wallboard to a stud
     subtype:  lodestone__loadstone  magnetite that possess polarity and has the power to attract as well as to be attracted magnetically
  subtype:  solenoid  a coil of wire around an iron core; becomes a magnet when current passes through the coil

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