The device sure looks like an electromagnet made with magnet wire and a steel core. But when he shows the ends of the core, you’ll see that the side that attracts aluminum has a copper ring ...

Whether it's electric vehicles, drones, or spacecraft, a common technical challenge for future transportation is lightweighting.

The exact origin of coil whine lies in the electromagnetic coils present in your PC's components, particularly the graphics card and power supply.

In order to make electric current flow in a circuit, you need to have an electromagnetic effect and create an electromagnetic induction.

This article was originally published with the title “ Powerful Electromagnet for the Use of Oculists ” in Scientific American Magazine Vol. 105 No. 26 (December 1911), p. 573 doi:10.1038 ...

The exact origin of coil whine lies in the electromagnetic coils present in your PC's components, particularly the graphics card and power supply.