A Rod (Length = 10 Cm) Moves on Two Horizontal

Multiple Choice

A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12-Ω load resistor?

A) 0.32 A
B) 0.34 A
C) 0.37 A
D) 0.39 A
E) 0.43 A