Helmholtz coil pair Helmholtz-Coil Fields by Franz Kraft, The Wolfram Demonstrations Project. Kevin Kuns (2007) Calculation of Magnetic Field inside Plasma Chamber, uses elliptic integrals and their derivatives to compute off-axis fields, from PBworks. Magnetic Fields of Coils http://physicsx.pr.erau.edu/HelmholtzCoils/ Electromagnetic coils Magnetic devices Hermann von Helmholtz