Answer Happy

8. A long vertical wire carries a steady 10-A current. A pair of rails are horizontal and are 0.20 m apart. A 20-2 resistor connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a constant velocity of 0.60 m/s, as shown. The bar and the rails have negligible resistance. At a given instant ti, the bar is 0.20 m from the wire, as shown. In Fig. 29.3a, at time to, what are the induced current and its direction through the resistor? Figure 29.3a 2.00 -0.20 m IOA V=0.60 200 0.30 m
10. An infinitely long current I flows on either side of a rectangular loop as shown in the figure at the left. Determine an expression for the total magnetic flux that penetrates the loop, in terms of the variables given. Hint: use the following result for the flux due to a single infinitely long line current, and assume that linearity holds for this problem. 1