MAGNETIC MATERIAL

Diamagnetic Material

The materials that allow flow of magnetic field through them are called as Magnetic Materials.

• In Diamagnetic material there is no magnetism in the absence of external magnetic field. (Shown in fig. 1)

• When magnetic field is applied dipoles are induced and they orient in a direction opposite to external magnetic field. (As in Fig.2)

Magnetization

   Ability of dipoles to align when magnetic field is applied.

Susceptibility (X)

Susceptibility (X) is a measure of material to get magnetized when external magnetic field is applied.

M & H are opposite

X < 0

Relative Permeability (μr)

Relative Permeability of a material is related to ability of material to allow magnetic field line to pass through it.

μ=μoμr

Where μo = Permeability of free space

                    = 4π∗10^(-7)   H/m

                   μr=1+X<1

                   μ< μo

Magnetic Flux Density (B)

• B represents the closeness of magnetic field lines to each other

•In a diamagnetic material magnetic field lines diverge away from each other

•Example:- Copper  (Cu), Silicon (Si), Germanium (Ge), Gold and Diamond