Tue January 08, 2013 By: Shrijeet

Explain the phenomenon hystersis....

Expert Reply
Wed January 09, 2013
Hysteresis occurs in ferromagnetic  materials and ferroelectric  materials, as well as in the deformation of some materials in response to a varying force.
In natural systems hysteresis is often associated with irreversible thermodynamic change.
When a ferromagnetic material is magnetized in one direction, it will not relax back to zero magnetization when the imposed magnetizing field is removed. It must be driven back to zero by a field in the opposite direction. If an alternating magnetic field is applied to the material, its magnetization will trace out a loop called a hysteresis loop.
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