Aconducting bar slides without friction on two parallel horizontal rails that are 50 cm apart and connected by a wire at oneend. the resistance of the bar and the rails is constant and equal to 0.10 ω. a uniform magnetic field is perpendicular to theplane 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. whatis the magnitude of the magnetic field?
a. 0.36 tb. 0.10 tc. 0.54 td. 0.93 te. 0.25 t