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Law of Conservation of Energy

111.Ques-Asse...

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111.Ques-Assertion reason based A: A system displaying a hysteresis loop such as a ferromagnet is a device for storing memory. R: Magnetisation of a ferromagnet is not a single valued function of the magnetising field rather it depends both on the field and also on history of magnetisation.

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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.

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. Answer the following questions:
(a) Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?
(b) Why is diamagnetism, in contrast, almost independent of temperature?
(c) If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?
(d) Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields?
(e) 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?
(f) Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a ferromagnet?

Q. A magnetising field intensity of

1000 \frac{A}{m}

produces magnetic flux density

0.25 \frac{W b}{m^{2}}

in a ferromagnetic substance. The relative permeability of ferromagnetic substance is )(Approximately)

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