A coil of wire, or solenoid, consists of a wire coiled up into a spiral shape. When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet.

An MRI machine manufacturer was experiencing image quality issues, particularly the appearance of artifacts during scans.

Save guides, add subjects and pick up where you left off with your BBC account. The induced voltage produces an induced current if the conductor is connected in a complete circuit. As with all ...

Faraday also observed that it was more efficient if the coil was wound around a metal core, as this helped to concentrate the magnetic field.