Electromagnets are made of soft iron because soft iron has

In a hysteresis loop the retentivity and coercive force ae defined as follows:



Retentivity : the remaining value of magnetization when magnetic intensity is made zero depicted by length OC is known as retentivity of material


Coercive force: the value of magnetic intensity (H) needed to make magnetization zero is known as zero depicted by length OD is known as coercive force .


Soft iron is easily magnetized by a magnetic field but only a small magnetization is retained when the field is removed and hence has low retentivity and low coercive force.


These properties are desired by electromagnets.


Therefore, electromagnets are made of soft iron because of low retentivity and low coercive force

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