When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram ... This self-sustaining loop is known as the geomagnetic dynamo. Energy is needed ...

It’s thus worth putting in the effort to make a better antenna, and if you’re not fortunate enough to have a lot of space, your best choice may be a magnetic ... around. The idea of a loop ...

How a Generator Works When an electric current flows through a wire, it generates a three-dimensional magnetic force field around the wire, similar to that surrounding a bar magnet. Magnets are ...

Magnetism is caused by the fields that exist around magnets. These magnetic fields can be investigated by looking at the effects of the forces they exert on other magnets and magnetic materials.

The iron core increases the coil’s magnetic field strength. A simple electromagnet is made by coiling wire around an iron nail. An iron core makes a temporary electromagnet. It loses its ...

The other magnetic field going around the length of the doughnut is referred to as toroidal (green horizontal circle). The combination of these two fields creates a three-dimensional curve, like a ...