The typical saturation magnetic field of stuff like iron, is about 1 tesla. (0.3 to 2.2 teslas more precisely for a selection of commercial materials.) However, the obvious tesla-unitted quantities you construct from the right fundamental constants are far larger: (bohr magneton)*(bohr radius)^(-2)*(elementary charge)^(-2)*(electron mass) =117.526 kiloTesla. Also, e^(-3) * m_e^2 * c^3 * epsilon_0 = 48.1 gigaTesla. If you tried using nuclear masses instead of electron masses, or electron Compton wavelengths instead of bohr radii, these discrepancies would only get huger. (They'd get smaller if you used nuclear magnetons instead of bohr magnetons, but that would definitely be physically wrong since we know ferromagnetism has nothing to do with nuclear magnetism since there is no isotope effect.) Why these enormous discrepancies? -- Warren D. Smith http://RangeVoting.org <-- add your endorsement (by clicking "endorse" as 1st step)