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The area of hysteresis material of a loop of a material is equivalent to 200 J. When 5 kg material is magnetised by an alternating field of 50 Hz then energy lost in one hour will be (density of material is 8 g/cm3

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Q. The mass of a specimen of a ferromagnetic material is

0.6 k g

and its density is

7.8 \times 10^{3} k g / m^{3} .

If the area of hysteresis loop of alternating magnetising field of frequency

50 H z

0.722 M K S

units then the hysteresis loss per second will be :-

Q. The mass of a specimen of a ferromagnetic material is

0.5 kg

and its density is

8000 {kg/m}^{3}

. What is the energy equivalent area of hysteresis loop of alternating magnetizing field of frequency

100 Hz

, if the hysteresis loss per second is

240 \times 10^{- 3} J/s

?

Q. When a ferromagnetic material goes through a hysteresis loop, its thermal energy is increased. Where does this energy come from?

Q. Answer the following questions:
(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.

Q. Answer the following questions:(a) Explain qualitatively on the basis of domain picture theirreversibility in the magnetisation curve of a ferromagnet. (b) The hysteresis loop of a soft iron piece has a much smaller areathan that of a carbon steel piece. If the material is to go throughrepeated cycles of magnetisation, which piece will dissipate greaterheat energy? (c) ‘A system displaying a hysteresis loop such as a ferromagnet, isa device for storing memory?’ Explain the meaning of thisstatement. (d) What kind of ferromagnetic material is used for coating magnetictapes in a cassette player, or for building ‘memory stores’ in amodern computer? (e) A certain region of space is to be shielded from magnetic fields.Suggest a method.

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