In general, by utilizing Ampère’s Circuital Law, it is straightforward to derive the formula for the magnetic induction intensity around a uniformly current-carrying cylindrical surface, except on the surface of the cylinder itself: $$B(r)=\begin{cases} 0 & if 0 < r < R \\ \frac{\mu_0 I}{2\pi r} & if r > R \\ \end{cases}$$ For the … Continue reading Magnetic Field Intensity Around a Uniformly Carrying Cylindrical Surface