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

As you may have guessed, this kind of detector works by detecting an inductance change in a wire loop (aka coil) buried in the road. Having a car pass several inches on top of it produces such an ...

The simple wire-loop game is often built as a fun project ... The player must guide a metal ring around the puzzle without touching it. A buzzer and light is used to indicate to the player when ...