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Standard XII
Physics
Permeability
The area of h...
Question
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
×
10
3
k
g
/
m
3
.
If the area of hysteresis loop of alternating magnetising field of frequency
50
H
z
is
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
×
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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