A metal wire of mass m = 0.450 kg slides without friction on two horizontal rails spaced a distance d = 0.10 m apart, as in the figure. The track lies in a vertical uniform magnetic field B= 0.50 T. There is a constant current i = 0.15 A through generator G, along one rail, across the wire, and back down the other rail. Find the speed and direction of the wire's motion as a function of time, assuming it to be stationary at t= 0. Evaluate for t= 0.2 s. Take positive to the right and negative to the left. 0.003 m/s d m B m