名詞 electromagnet:

1. a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet

e.lec.tro.mag.net

n.（名詞）
A magnet consisting essentially of a coil of insulated wire wrapped around a soft iron core that is magnetized only when current flows through the wire.
電磁體：一種磁體，主要由絕緣線圈纏繞的一個軟鐵芯子組成，只有當(dāng)電流通過線圈時芯子才被磁化