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Magnetic Classification Of Substances
(i) What is meant by a paramagnetic substance? State Curie’s law.
(ii) What is the value of magnetic susceptibility of Aluminium of its relative permeability is 1.000022?
(i)
Paramagnetic substance—These are those substances when placed in an external magnetic field, are feebly magnetised in the direction of magnetising field, e.g.—Al, Na, Pt etc.
Curie’s Law—The susceptibility of a paramagnetic substance varies inversely as the Kelvin temperature of the substance.
This is known as Curie’s Law.
(ii)
Given:
μr = 1.000022.
We know,
μr = 1 + Xm
1.000022 = 1 + xm
So, Xm = 0.000022
The loss of power in a transformer can be reduced by:
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Increasing the number of turns in primary
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Increasing ac voltage applied to primary.
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Using a solid core made of steel.
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Using a laminated core of soft iron.
D.
Using a laminated core of soft iron.Arrange the three types of magnetic materials, i.e., paramagnetic, diamagnetic and ferromagnetic materials, in decreasing order of their magnetic susceptibility.
The paramagnetic, diamagnetic and ferromagnetic materials can be arranged in decreasing order of magnetic susceptibility is as follows:
Ferromagnetic > Paramagnetic > Diamagnetic
State how the magnetic susceptibility of a ferromagnetic material changes when it is heated.
When a magnetic material is heated its magnetic susceptibility decreases.
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Mock Test Series
Mock Test Series