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Standard VI
Physics
Magnetism
What is the m...
Question
What is the meaning of core material in magnetism?
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Q.
Why is the core of a transformer made of magnetic material of high permeability?
Q.
A rod is inserted as the core in the current-carrying solenoid of the previous problem. (a) What is the magnetic intensity H at the centre? (b) If the magnetization I of the core is found to be 0.12 A m
−1
, find the susceptibility of the material of the rod. (c) Is the material paramagnetic, diamagnetic or ferromagnetic?
Q.
The magnetic flux through toroid changes from
0.65
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b
t
o
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when the air-core is replaced by some other material. What is the value of the relative permeability of the material?
Q.
A toroid made up of a circular core has inner circumference
30
π
cm
and
2400
turns. The relative permeability of the material is
1000
. What is the cross-sectional area of the core when a current of
0.75
A
passes through the winding, a magnetic field of strength
2
T
is produced at its mean radius ?
Q.
A solenoid has a core of a material with relative permeability
500
. The winding of the solenoid are insulated from the core and carry current of
5
A
. If the number of turns are
1000
per metre, what is the intensity of magnetization of the core?
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