Magnetic Properties of Matter – Formulae - July Dec Revision

Ch. 37 Magnetic Properties of Matter – Formulae

1. Magnetization vector = Magnetic moment per unit volume

I = M/V

2. Magnetic intensity

H = B/µ₀ - 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 = χH … (6)

Χ is called the susceptibility of the material.

7. Permeability

B = µH … (7)

µ = µ₀ (1+χ) is a constant and is called the permeability of the material.

µ₀ is the permeability of vacuum.

µ_r = µ/µ₀ = 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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