A coaxial cable is constructed from a central cylindrical conductor of radius $r_A = 1.60$ cm carrying current $I_A = 9.20$ A in the positive $z$ direction and a concentric conducting cylindrical shell with inner radius $r_B = 14.0$ cm and outer radius $r_C = 15.0$ cm with a current of $22.0$ A in the negative $z$ direction (see figure below). What are the magnitude and direction of the magnetic field at the following points?
(a) at point O, a distance of $10.0$ cm from the center of the coaxial cable along the $y$ axis
magnitude $194.4$ $\mu$T
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully.
direction $+z$
(b) at point P, a distance of $20.0$ cm from the center of the coaxial cable along the $y$ axis
magnitude $12.8$ $\mu$T
direction $-x$