Magnetic Vector Potential - Oregon State University
https://books.physics.oregonstate.edu/GSF/vpot.html
WEBThe vector potential due to a ring of current, in the plane of the ring, with either \(s\ll R\) or \(s\gg R\text{,}\) turns out to be \begin{align*} \AA = \frac{\mu_0 I}{4} \begin{cases} \frac{s}{R} \left( 1 + \frac38 \frac{s^2}{R^2} + ... \right) \phat \amp (s\ll R)\\ \frac{R^2}{s^2} \left( 1 + \frac38 \frac{R^2}{s^2} + ... \right) \phat \amp ...
DA: 72 PA: 31 MOZ Rank: 64