Magnetic Terms

Table of Magnetic Terms and Conversions

Magnetic Term	Symbol	CGS unit	Conversion factor	SI Unit
Magnetic field	H	Oe	79.6	A/m
Mass magnetization	M	emu/g	1	A.m2/kg
Magnetic Induction	B	G	10-4	T, Wb/m2
Magnetic moment	m	emu	10-3	A.m2, J/T
Magnetic permeability	µ	G/Oe	1.26x10-6	H/m, Wb/(A.m)
Magnetic flux	Greekphi	Mx	10-8	Wb, V.s
Anisotropy const	K	erg/cc	0.1	J/m3
Magnetostriction const.	lambda	No dimension	1	No dim
Energy density	W	erg/cc	0.1	J/m3
Energy Product	(BH)max	MGOe	0.126	kJ/m3

 

---

 Magnetic Field (H)

 

The magnetic field generated by a current, I passing through a solenoid of turns N and length L is given by H = NI/L

The unit of magnetic field is A/m.

 Magnetic Moment (m)

The magnetic moment of the solenoid is given by m= NIA and the unit is A.m²

Magnetic Induction (B)

If a magnetic material is subjected to magnetic field, the material is magnetized and posses N and S poles

The magnetic induction is given by the extent to which the lines of magnetization add to a material in an applied field

B=µ_o(H+M)        where µ_o is the permeability of free space, H is the magnetic field and M is the magnetization.

Susceptibility (chi)

Susceptibility of a magnetic material determines how responsive a material is to an applied magnetic field

chi=M/H