Tag: physics

The Curie temperature is the temperature above which ferromagnetic materials lose their permanent magnetic field, the magnetism completely disappears. Above Curie temperature, the material behaves para-magnetically.

When a ferromagnetic material is placed in an external magnetic field, the magnetic domains that are aligned with the field grow in size at the expense of those that are not, leading to magnetization.

Magnetic susceptibility is defined as the ratio of magnetization to the magnetic field intensity. For diamagnetic materials, the induced magnetization is in the opposite direction to the applied field, resulting in negative susceptibility.

Diamagnetic           Paramagnetic             Ferromagnetic
-1 $\leq$ $\chi$ < 0                  0 < $\chi$ < $\varepsilon$                  $\chi$ >> 1
0 $\leq$ $\mu _{r}$ < 1                1 < $\mu _{r}$ < 1+ $\varepsilon$               $\mu _{r}$ >> 1
$\chi$ $=$ magnetic susceptibility
$\mu _{r}$ $=$ relative permeability.
$\varepsilon$ < 1 and small.

diamagnetic material
$-1\leq \chi < 0$
0 $\leq$ $\mu$ < 1
$\chi$ $=$ Magnetic susceptibility
$\mu$ $=$ permeability

Diamagnetic sultance
-1 $\leq$ $\chi < 0$ 
$\theta =\mu < 1$
$\chi =susceptibility$

If pitch is high frequency is high and vice versa.

Our inner ear is shaped like a snail and is called cochlea.

Combination of notes that produced jarring effect on the ear is called discord. Discord is lack of harmony between notes sounding together.