One of the primary ways to

measure the

magnetic field strength, the magnetic flux density is the amount of

magnetic flux, Phi,

per a given

area, A. It is usually represented with the

vector **B**, and

measured in

units of

Tesla (T). There are several ways of

calculating the magnetic flux density:

Where μ is the permeability of the region, **H** is the magnetic field intensity, and A is the area that the flux Phi passes through. Note that this second equation must be used with some care, as it is really a (albeit common) special case of the more general equation:

Phi = Integral{ **B·ds** } over s

Where s is the surface with the area A.