ETS-Lindgren 6404 Helmholtz Coil - Manual (Page 14)

14 | Theory of Operation
In SI Units, this becomes the formula where
R
NI
H 715 . 0 ≈
• H is the magnetic field in amperes per meter
• N is the number of turns per coil
• I is the coil current in amperes
• R is the coil radius in meters
If instead of magnetic field intensity (H) the magnetic flux density (B) is the
parameter of interest the equation, when expressed in CSG units,
becomes
R
NI
H B μ μ 899 . 0 ≈ =
• B is the magnetic flux density in gauss
• µ is the relative permeability
• N is the number of turns per coil
• I is the coil current in amperes
• R is the coil radius in centimeters