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Wiedemann effect
The Wiedemann effect is the twisting of a ferromagnetic rod through which an electric current is flowing when the rod is placed in a longitudinal magnetic field, caused by the total helical magnetic field. It is the inverse of the Matteucci effect. It was discovered by the German physicist Gustav Wiedemann in 1858 . The Wiedemann effect is one of the manifestations of magnetostriction in a field formed by the combination of a longitudinal magnetic field and a circular magnetic field that is created by an electric current. If the electric current (or the magnetic field) is alternating, the rod will begin torsional oscillation.
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