d FIGURE 28-8 B b 14) Fig. 28-8 shows the cross-section of a hollow cylinder of inner radius a = 5 cm and outer radius b = 7 cm. A uniform current density j = 1 A/cm² flows through the cylinder. Calculate the magnitude of the magnetic field at a distance d = 10 cm from the axis of the cylinder. NOTE: YOU MUST DERIVE THE EQUATION YOU USE BY USING AMPERE'S LAW A) 2.5 × 10-4 T B) 0 x C) 4.5 × 10-4 T x D) 0.5 x 10-4 T E) 1.5 × 10-4 T x