Given: Assume the bar and rails have negligible resistance and friction. In the arrangement shown in the figure, the resistor is 4 Q and a 5 T magnetic field is directed into the paper. The separation between the rails is 3 in. Neglect the mass of the bar. An applied force moves the bar to the right at a constant speed of 3 m/s . At what rate is energy dissipated in the resistor? Answer in units of W.