Question

(a) Explain qualitatively on the basis of domain picture the irreversibility in the

magnetisation curve of a ferromagnet.

(b) 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 magnetisation, which

piece will dissipate greater heat energy?

(c) ‘A system displaying a hysteresis loop such as a ferromagnet, is a device for storing

memory?’ Explain the meaning of this statement.

(d) What kind of ferromagnetic material is used for coating magnetic tapes in a cassette

player, or for building ‘memory stores’ in a modern computer?

(e) A certain region of space is to be shielded from magnetic fields.Suggest a method.​

Answer 1

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☞refer the above attachment :

(a) It can be observed from the given curve that magnetisation persists even when the external field is removed. This reflects the irreversibility of a ferromagnet.

(b) The dissipated heat energy is directly proportional to the area of a hysteresis loop. A

carbon steel piece has a greater hysteresis curve area. Hence, it dissipates greater heat energy.

(c) The value of magnetisation is memory or record of hysteresis loop cycles ofmagnetisation. These bits of information correspond to the cycle of magnetisation.Hysteresis loops can be used for storing information.

(d) Ceramic is used for coating magnetic tapes in cassette players and for buildingmemory stores in modern computers.

(e) A certain region of space can be shielded from magnetic fields if it is surrounded bysoft iron rings. In such arrangements, the magnetic lines are drawn out of the region.

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