Physics 102 help?

Question

A unusual messege delivery system is pictured . A 15-Cm length of conductor that is free to move is held in place between two thin conductors. When a 5 -A current is directed the wire segment moves upward at a constant velocity. IF the mass of the wire is 0.15 kg find the magnitude and direction of the minumum magnetic field required to move the wire. ( the wire slides without friction on the two vertical conductors.)

Answer 1

http://theory.uwinnipeg.ca/physics/mag/n...

so 0.15*9.8 (about) = B*0.15*5 or B~ 9.8/5  but what units?  

http://en.wikipedia.org/wiki/Laplace_for... - Tesla

Oh - normal to the plane containing the wires