electromagnet
 電磯( 起重機 )
 E·lec·tro-mag·net n. A mass, usually of soft iron, but sometimes of some other magnetic metal, as nickel or cobalt, rendered temporarily magnetic by being placed within a coil of wire through which a current of electricity is passing. The metal is generally in the form of a bar, either straight, or bent into the shape of a horseshoe.
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 electromagnet
      n : a temporary magnet made by coiling wire around an iron core;
          when current flows in the coil the iron becomes a magnet