Problem 2 (30 points) Suppose that an external pulling force of a) 10N, b) 30N or ) SON directed toward the top of the page is applied to the bar as shown in below figure, the weight of sliding bar is 30N. In steady state for these three situations, respectively, 1) Is the machine acting as a motor or as a generator? Explain the reason. 2) What is the power lost to heat on the resistance R, , and the energy conversion efficiency? 3) What is the sliding speed of the bar? Frictionless rails Uniform field directed outof page B=13T Sliding bar