Electric and Magnetic Quantities Units and Conversions

Where:

Length = L
Mass = M
Time = T
Current = Q/T
Charge = Q

Electric and Magnetic Quantities

Conversion of mksq Units to Gaussian Units

Gaussian Units

*c = vel. of light (free space) in cm/sec ≈ 3 × 10¹⁰ Use of table:
1 coulomb = 10-1 (3 × 10¹⁰) statcoulomb = 3 × 10⁹ statcoulomb

QUANTITY	SYMBOL	SI UNIT	SI EQUATION	CGS UNIT	CGS EQUATION	CONVERSION FACTOR
Magnetic induction	B	tesla (T)	B=µ o (H+M)	gauss (G)	B = H+4πM	1 T = 10 4 G
Magnetic field strength	H	ampere/ meter (A/m)	H = N×I/lc ( lc - magnetic path, m)	oersted (Oe)	H = 0.4πN×I/lc (lc - magnetic path, cm)	1 A/m = 4π×10 -3 Oe
Magnetic flux	Φ	weber (Wb)	Φ = B×Ac (Ac - area, m 2 )	maxwell (M)	Φ = B×Ac (Ac- area, cm 2 )	1 Wb = 10 8 M
Magnetization	M	ampere/ meter (A/m)	M=m/V (m- total magnetic moment, V- volume, m 3 )	emu/cm 3	M=m/V (m- total magnetic moment, V- volume, cm 3 )	1 A/m = 10 -3 emu / cm 3
Magnetic permeability of vacuum	µ o	newton/ ampere 2	µ o = 4π×10 -7	1	-	4π×10 -7
Inductance	L	henry	L=μ o μN 2 Ac/lc (Ac- area, m 2 , lc - magnetic path, m)	henry	L=0.4πμN 2 Ac/lc×10 -8 (Ac-area, cm 2 , lc - magnetic path, cm)	1
Emf (voltage)	V	volt	V=-N×dΦ/dt	volt	V= - 10 -8 N×dΦ/dt	1
Note: in the above equations: N- turns, I - current (in amps)