Q17 of 44 Page 202

Answer the following question:

Explain qualitatively on the basis of domain picture the irreversibility in the magnetization curve of a ferromagnet.

The relation between B (i.e. the external magnetic field) and H (i.e. magnetic intensity) in ferromagnetic materials is shown in the following curve.



From the above curve it is clear that magnetization persists even when the external field is removed, this depicts the irreversibility of magnetization in a ferromagnet.


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Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.) Why?

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Would the maximum possible magnetization of a paramagnetic sample be of the same order of magnitude as the magnetization of a ferromagnet?

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Answer the following question:

The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetization, which piece will dissipate greater heat energy?

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Answer the following question:

‘A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory?’ Explain the meaning of this statement.