What is a Magnetar? A device consisting of a magnetic core and a coil that generates a magnetic field when a current flows through the coil. Electromagnet Right! A device consisting of a magnetic core and a coil that generates a magnetic field when a current flows through the coil. Chinese name: ; English name: electromagnet; IN OTHER LANGUAGES English Čeština Dansk Deutsch Svenska Français Italiano Nederlands Norsk Polski Português Español 日本語 한국어