The magnetic field produced by current →J(→r′) diminishes with distance squared, and therefore the magnitude of the uniform field →H ...The magnetic field produced by current →J(→r′) diminishes with distance squared, and therefore the magnitude of the uniform field →H within the inductor is dominated by currents within a distance of ~d of the inductor ends, where d is the nominal diameter or thickness of the inductor [see Figure 3.2.3(a) and assume d ≅ D << W].
