These devices share their name with the Smale-Williams strange attractor, which is formed by an iterated map on the solid torus. In fluidic control systems, these devices name and toggle a type of valve that can be either “normally open” or “normally closed.” The vector potential of one of these devices only has a theta component. These devices name the rotational component (15[1])of a Helmholtz (15[1])decomposition, (15[1])which is a vector field with (15[1])zero (*) divergence. (10[1])A toroid (10[2])is a circular one of these devices (10[1])used to confine plasmas (-5[1])in tokamaks. (10[1]-5[2])Ampere’s law can be used to show that the magnetic (-5[1])field (10[1])in one of these devices (10[1])is “mu-naught (10[1])I N,” (10[1])where N is the number (10[1])of turns per unit length. (10[1])For 10 points, name these coils of wire commonly used (10[1])as inductors. ■END■ (10[5]0[2])