A conductor bar with mass m and length L slides over horizontal rails that are connected to a voltage source. The voltage source maintains a constant current I in the rails and bar, and constant, uniform, vertical magnetic field `vecB` fills the region between the rails (as shown in Fig.)
If the bar has mass m, find the distance d that the bar must move along the rails from rest to attain speed v.
A. `(3v^2m)/(2ILB)`
B. `(5v^2m)/(2ILB)`
C. `(v^2m)/(ILB)`
D. `(v^2m)/(2ILB)`