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Magnetisation and magentic intensity is considered one of the most asked concept.
15 Questions around this concept.
Relative permittivity and permeability of a material are , respectively. Which of the following values of these quantities are allowed for a diamagnetic material?
The magnetic intensity (H)-
The magnetic intensity of the magnetizing field is given by
And its S.I. unit is A/m while its C.G.S. Unit is oersted.
Magnetization (M) -
Magnetization is a process in which a normal material is converted into a magnetic material by exposing it to an external magnetic field. The magnetic intensity is the reason due to which a normal material changes into magnetic material.
We define magnetization M of a sample to be equal to its net magnetic moment per unit volume i.e
Consider a long solenoid of n turns per unit length and carrying a current i
The magnetic field in the interior of the solenoid is given by
If then where N=number of turns and L=length of solenoid
Using So we can write
If the interior of the solenoid is filled with a material with non-zero magnetization then the material will magnetize.
And the field inside the solenoid will be greater than B0.
The net B field in the interior of the solenoid may be expressed as
B - total magnetic field
- the magnetic field in vacuum
- magnetic field due to magnetization of the material
And is proportional to the magnetization M of the material and is expressed as
And using we can write
So we get
So we get
The Magnetization (M) of material is influenced by The magnetic intensity (H)
So the elation between M and H is given as
where is called magnetic susceptibility. And it is a measure of how a magnetic material responds to an external field.
Using in
we get
where is called relative magnetic permeability of the substance.
and is the magnetic permeability of the substance
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