When a ferromagnetic material goes through a hysteresis loop, the magnetic susceptibility

Magnetic susceptibility () is given by formula


..(i)


When a ferromagnetic material goes through a hysteresis loop



At point C:


Magnetic intensity H becomes 0 whereas magnetization I is finite.


From(i) we get


At point G:


Magnetization I, becomes 0 whereas H is finite


From(i) we get


In the second quadrant H is negative whereas I is positive therefore


Becomes negative here


Therefore, when a ferromagnetic material goes through hysteresis loop the magnetic susceptibility may be zero, may be negative and may be infinity.

1