The magnetic field produced by current \( \overrightarrow{\text{J}}(\overrightarrow{\text{r}^{\prime}})\) diminishes with distance squared, and therefore the magnitude of the uniform field \(\vec H\) ...The magnetic field produced by current \( \overrightarrow{\text{J}}(\overrightarrow{\text{r}^{\prime}})\) diminishes with distance squared, and therefore the magnitude of the uniform field \(\vec H\) 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].
