Q.Define magnetization. State its S.I. unit and dimensions. What is the relation between permeability and magnetic susceptibility?

Magnetization measures how strongly a material is magnetized per unit volume; it relates to susceptibility and permeability through $\mu_r = 1+\chi$.

Magnetization ($M$): defined as the net magnetic moment per unit volume of a magnetic material:

$M = \frac{m}{V}$

where $m$ is the (net) magnetic dipole moment and $V$ is the volume of the material.

SI unit: ampere per metre (A/m) — the same unit as magnetic field intensity $H$.

Dimensional formula: since magnetic moment has dimensions $[L^2 A]$ (current $\times$ area) and volume has dimensions $[L^3]$:

$[M] = \frac{[L^2A]}{[L^3]} = [L^{-1}A^1]$

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