In the equations from our Surface Fields article, we use a "B" to denote this term. Unlike Magnetic Flux above, the Flux Density defines some size for the loop of wire in that example. Flux Density is a measure how many webers are squeezed into some area. In fact, webers per square meter is the unit for flux density.
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The magnetic flux density is measured in Webers per square meter [Wb/m^2], which is equivalent to Teslas [T]. The B field is a vector field, which means it has a magnitude and direction at each point in space. We know that a particle with a charge q [C] will experience a force when in the presence of an Electric Field E.