Problem Solving: You must show all work and keep tree]: of units. J nstify any equation{s} used in your solution. You just need to solve si: {ti} out of the following seven {1'} problems. If you decide to do all seven, [will take the six with the highest point totals. 11) The gure below shows a conducting her of mass m = 0.2m kg that can slide without friction on a pair of rails separated by a distance 1 = 1.21} m and located on an mclmcd plane that makes an angle q = Eio with respect to the ground. The resistance of the resistor is R = 1.1m W, and a uniform magnetic eld of magnitude B = 11.501} T is directed downward, perpendicular to the ground, over the entire region through which the bar moves. With what constant speed 1! does the har slide along the rails? (16 points]