Define magnetic hysteresis and write it's significance.
Lagging of magnetic field behind the magnetizing field in a ferromagnetic material taken through a cycle of magnetization is called the hysteresis.
From the hysteresis loop, a number of primary magnetic properties of a material can be determined.
Retentively- A measure of the residual flux density corresponding to the saturation induction of a magnetic material. In other words, it is a material's ability to retain a certain amount of residual magnetic field when the magnetizing force is removed...