Hysteresis loop

Suppose a ferromagnetic material which is in a complete demagnetized state, i.e. one in which B = H = 0 be subjected to increasing magnetic field strength H and the corresponding flux density B measured. The diagram below shows resulting relationship between B and H on the the curve Oab. At a particular value of H, shown as Oy, it becomes very inconvineint to increase the flux density any more. The material is said to be saturated. Thus b_y is the point of saturation flux density.

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