The diagram shows four circular Amperian loops ( a , …
The diagram shows four circular Amperian loops ( a , b , c , d ) and, in cross section, four long circular conductors (the shaded regions), all of which are concentric. Three of the conductors are hollow cylinders; the central conductor is a solid cylinder. The currents in the conductors are, from smallest radius to largest radius, 4 A out of the page, 9 A into the page, 5 A out of the page, and 3 A into the page. Rank the Amperian loops according to the magnitude of ∮ B → · d l → around each, greatest first. fig_q9_t2.jpg