정의: An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of copper wire wound into a coil. A current through the wire creates a magnetic field which is concentrated along the center of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
| 핵심 연구 분야 | Infrastructure |
|---|---|
| 주요 연도 | 2020년 |
| 주요 연관 키워드 | speed |
| 좋아요 수 | 0 |