Show all work and specify the correct answer at the bottom! a conducting bar slides without friction on two parallel horizontal rails that are 50 cm apart and connected by a wire at one end. the resistance of the bar and the rails is constant and equal to 0.10 ω. a uniform magnetic field is perpendicular to the plane of the rails. a 0.080-n force parallel to the rails is required to keep the bar moving at a constant speed of 0.50 m/s. what is the magnitude of the magnetic field? 0.36 t0.10 t0.54 t0.93 t0.25 t