Two rails and a rod (magnetic field)

lalala_land89
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Homework Statement


Two stiff parallel wires a distance L apart in a horizontal plane act as rails to support a light metal rod of mass m(perpendicular to each rail). A magnetic field B, directed out of the page(textbook page) acts throughtout. At t=0 , wires connected to the rails are connected to a constant current-source and a current I begins to flow through the system. East to the bottom rail, north to the rod , west to the upper rail. Determine the speed of the rod as a function of time a) assuming there's no friction b) there's friction cofficient U c) In which direction does the rod move, east or west , if the current through it is north?


Homework Equations



a) x=vt ? b) mechanical equaction Ffr= U Fn ?? c) west

I'm lost with this. help please.
 
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lalala_land89 said:
a) x=vt ?

Why do you think that is the answer? Do you have any thoughts/ideas on how to approach this problem?
 
The force on the wire is ILB. Then apply F=ma.
 

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