Force exerted by magnetic field


An electromagnet is a type of magnet in which the magnetic field is produced by electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet. The force exerted by an electromagnet on a section of core material is related to the magnetic field.

Related formulas


FForce exerted by magnetic field (N)
BThe magnetic field (T)
AThe area of the section of core material (m2)
μ0magnetic constant