1 Physics -- Magnetic Properties of Material

Define; a.Diamagnetic substance b. Ferromagnetic substances c.paramagnetic substances

Define; a.Diamagnetic substance b. Ferromagnetic substances c.paramagnetic substances

1 Answers

Diamagnetic	Paramagnetic	Ferromagnetic
The magnetic moment, intensity of magnetization and magnetic susceptibility are all negative while magnetic permeability has value less than1	The magnetic moment, intensity of magnetization and magnetic susceptibility are all positive while magnetic permeability has value slightly greater than1	The magnetic moment, intensity of magnetization and magnetic susceptibility are all positive and quite large and magnetic permeability is of the order of hundreds and thousands.
The magnetic susceptibility is independent of temperature	The magnetic susceptibility decrease with rise of temperature	The magnetic susceptibility decrease with rise of temperature
They are feeble repelled by the magnet and magnetic field	They are feeble attracted by the magnet and magnetic field	They are strongly attracted by the magnet and magnetic field
Eg Antimony Bismuth , copper	Eg aluminum ,chromium magnesium	Eg .cobalt nickelgadolinium
When the diamagnetic bar is suspended in a magnetic field it orient itself perpendicular to the applied field	When the paramagnetic bar is suspended in a magnetic field it orient itself in the direction to the applied field	When the ferromagnetic bar is suspended in a magnetic field it orient itself quickly direction to the applied field.

What is the susceptibility and permeability of a perfectly diamagnetic substance?

we know,

susceptibility = intensity of magnetization (I) / Magnetizing intensity (H)

permeability = 1 + susceptibility

for a perfectly diamagnetic substance,

intensity of magnetization (I) = -Magnetizing intensity (H)

negative sign shows that the opposite alignment of electrons against the direction of applied magnetic field.

thus, susceptibility = -1 ( acts as super conductor )

and, permeability =0 ( no magnetic lines of force pass through the material )

Permeability can also be understood by...

Paramagnetic and ferromagnetic substances can be distinguished by several ways. a. Distinguish them in term of curie temperature. ...

Define magnetic hysteresis and write it's significance.

Lagging of magnetic field behind the magnetizing field in a ferromagnetic material taken through a cycle of magnetization is called the hysteresis.

From the hysteresis loop, a number of primary magnetic properties of a material can be determined.

Retentively- A measure of the residual flux density corresponding to the saturation induction of a magnetic material. In other words, it is a material's ability to retain a certain amount of residual magnetic field when the magnetizing force is removed...