Chapter 30, Problem 16P

GO Figure 30-44a shows a wire that forms a rectangle (W = 20 cm, H = 30 cm) and has a resistance of 5.0 mΩ. Its interior is split into three equal areas, with magnetic fields ${\stackrel{\to }{B}}_1,{\stackrel{\to }{B}}_2$, and ${\stackrel{\to }{B}}_3$. The fields are uniform within each region and directly out of or into the page as indicated. Figure 30-44b gives the change in the components B_z of the three fields with time t; the vertical axis scale is set by B_s = 4.0 μT and B_b = −2.5B_s, and the horizontal axis scale is set by t_s = 2.0 s. What are the (a) magnitude and (b) direction of the current induced in the wire?

Figure 30-44 Problem 16.