1. Magnetization vector = Magnetic moment per unit volume

**I**=

**M**/V

2. Magnetic intensity

**H**=

**B**/µ

_{0}-

**I**.. (2)

Where

**H**= magnetic intensity

**B**- resultant magnetic field

**I**= intensity of magnetization

Magnetic intensity due to a magnetic pole of pole strength m at a distance r from it is

H = m/(4 πr²) …(5)

6. Magnetic susceptibility

**I**= χ

**H**… (6)

Χ is called the susceptibility of the material.

7. Permeability

**B**= µ

**H**… (7)

µ = µ

_{0}(1+χ) is a constant and is called the permeability of the material.

µ

_{0}is the permeability of vacuum.

µ

_{r}= µ/µ

_{0}= 1+ χ is called the relative permeability of the material.

9. Curie’s law

χ = c/T … (9)

where c = Curie’s constant

For ferromagnetic materials

Χ = c’/(T - T

_{c})

Where

T

_{c}is the Curie point and

c’ = constant

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