Talk:Magnetic induction

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 Definition A divergence-free electromagnetic field, denoted B, determining the Lorentz force upon a moving charge, and related to the magnetic field H. [d] [e]
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Magnetic field B is a force?

The intro says "magnetic induction (also known as magnetic flux density) describes a magnetic force..." That is a misstatement, as the force on a moving charge is the Lorentz force F = q (v × B).1

From a microscopic standpoint, the magnetic field B is fundamental because it determines the effects upon the dynamics of the charges. The magnetic field intensity (or whatever you want to call it) H is a derived quantity H = B0M. The magnetization M is determined by decisions about the level of detail one needs in describing ensembles of charges, and so is really a decision about how coarsely one can deal with portions of a system of charges, lumping some of them together in an ensemble as a "magnetic material". John R. Brews 13:48, 9 December 2010 (UTC)

I made some changes to reflect these remarks. John R. Brews 14:33, 9 December 2010 (UTC)