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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- resistor connects points 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 ms, as shown. The bar and the rails have negligible resistance. At a given instant to the bar is 0.20 m from the wire, as shown. In Fig. 29.3a, at time t, what are the induced current and its direction through the resistor? Figure 29.30 9. The circular loop shown in the figure to the right lies in the plane and has a radius of a 0.10 meter and a resistance of 5 ohms. Given that the a magnetic flux density in the vicinity of the loop has a value of B -0.20 sin 10't a, Wbém , determine a) the flux flowing through the loop. b) the voltage across the loop opening, and e) the current flowing in the loop. a 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. Г.