# Talk:Magnetic induction

## 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** = **B**/μ_{0} − **M**. 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)