Physics for Information Science: Unit III: Magnetic Properties of Materials
Magnetic Permeability and Susceptibility
It is the measure of the ease with which the specimen can be magnetised by the magnetising force.
MAGNETIC
PERMEABILITY AND SUSCEPTIBILITY
1. Magnetic Susceptibility (Xm)
It
is the measure of the ease with which the specimen can be magnetised by the
magnetising force.
It
is defined as the ratio between intensity of magnetisation (I) and the magnetic
field intensity (H)
(i.e.,) 
2. Magnetic Permeability (µ)
It
is defined as the ratio between the magnetic flux density (B) and the magnetic
field intensity (H)
It
is the measure of degree at which the lines of force can penetrate through the
material.
3. Relative Permeability (µr)
It
is the ratio between the permeability of the medium to the permeability of free
space.
4. Relation between μr and Xm
When
a magnetic material is placed in a magnetic field (H), then two types of lines
of induction passes through the material. viz.,
(i)
Due to magnetising field (H)
(ii)
Due to material itself being magnetised by induction (1)
Total
flux density B = µo (H+I) …….(1)
We
know, μ = B/H ⇒
B = μ H …….(2)
Equating
equation (1) and (2) we get
μH
= μo (H+I)
Since
μ = μo μr we have
Here
I/H = Xm
5. Retentivity (or) Remanence (Mr)
When
the external magnetic field applied to a magnetic material is removed, the
magnetic material will not loss its magnetic property immediately. There exits
some residual intensity of magnetisation in the specimen even when the magnetic
field is cut off. This is called residual magnetism or retentivity.
6. Coercivity (-HC)
The
residual magnetism can be completely removed from the material by applying a
reverse magnetic field. Hence Coercivity of the magnetic material is the
strength of reverse magnetic field (-Hc) which is used to completely
demagnetise the material.
Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : - Magnetic Permeability and Susceptibility
Physics for Information Science: Unit III: Magnetic Properties of Materials
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Physics for Information Science
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