Eddy current

Another name for eddy current is Foucault current.

Eddy currents are the electric currents intentionally or unintentionally induced in a flat conductor. It is a physical phenomenon that occurs when, for example, a changing magnetic field is in a metal plate. This could be an alternating field from an electric coil, but it could also be the result of movement that causes the plate to cut through the field lines. When a conductor cuts through magnetic field lines, a current is introduced in the conductor. Read more about eddy currents on Wikipedia.

Goudsmit Magnetics eddy current separators use this principle. These remove non-ferrous metal particles, such as copper and aluminium, in a continuous process, with the aim of recovering, recycling or disposing of metals.