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Question

Out of soft iron and steel which has more coercivity and less retentivity?


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Solution

Coercivity :

  • It is the intensity of the applied magnetic field required to reduce the magnetization of a given material to zero.
  • The ability of ferromagnetic material to withstand an external magnetic field without becoming demagnetized

Retentivity :

  • It is the capacity of an object to retain magnetism after the action of the magnetizing force has ceased.
  • It is a property of a magnetic material by which magnetism is left in the specimen even when the magnetising field is reduced to zero.

Since steel require a greater magnetic field so as to reduce magnetisation to zero.

Hence, steel has more coercivity and less retentivity compared to soft iron.


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