Rod Moving on Parallel-Conducting Rails

[fisixC]

Homework Statement

A straight rod moves along parallel conducting rails, as shown below. The rails are connected at the left side through a resistor so
that the rod and rails form a closed rectangular loop. A uniform field perpendicular to the
movement of the rod exists throughout the
region.
Assume the rod remains in contact with
the rails as it moves. The rod experiences no
friction or air drag. The rails and rod have
negligible resistance.

At what speed should the rod be moving to
produce the downward current in the resistor?
Answer in units of m/s.

Homework Equations

emf = vlB
v = IR

The Attempt at a Solution

I attempted to solve the two equations for velocity resulting in:

v = (IR)/(lB) which didn't yield a correct answer

Is there something I have to do special because there is a mass of the rod?

 

[supratim1]

where is the figure? what is the required current in the resistor (the value of I)?

 

[SammyS]

I that the exact wording of the question? Does the missing figure contain additional information?

How much current must be produced? What is the resistance of the resistor. What is the separation of the rails? What is the direction & strength of the magnetic field?