APPENDIX A: MAGNETIC UNITS

Quantity
Symbol (SI)
Unit (SI)
Symbol(cgs)
Unit (cgs)
Relationship
Energy E Joule (J) erg 1 J = 107 erg
Force F 1N = kg·m/s2 dyne = g·m/s2 1 N = 105 dyne
Current I Ampere(A) = Cs abampere = 10 C/s 1 A = 0.1 abampere
Induction in free space (field) B0 Tesla (T) B Gauss (G) 1 T = 104 G
Magnetic force (field) H A/m H Oersted (Oe) 1 A/m = 410–3 Oe; 1 Oe = 10–4 T = 0.1 mT
Permeability of a vacuum 0 = 410–7 Hm–1 0 = 1 1 Hm–1 = 107/4 G/Oe
Induction:          
Induction in free space (field) B0 = 0H H 1T = 104 G
Induction in medium B = B0 + 0M B = H + 4 1T = 104 G
Magnetization:          
Per unit volume M A/m I G 1 A/m = 10–3 G
Per unit mass = M/ Am2/kg = I/ G·cm3/g 1 Am2/kg = 1 G·cm3/g
Susceptibility:          
Per unit volume = M/H Dimensionless = I/H Dimensionless 1 (SI unit) = 4 G/Oe = 1 (cgs unit)/4
Per unit mass = / m3/kg = / cm3/g 1 m3/kg = 410–3 G/Oe·cm3/g

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