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bar sliding in a magnetic field on rails - Voltage induced

Imagine that we have two metal rails 20 cm apart connected by a light bulb. The rails are placed in a 1.0 T magnetic field oriented vertically downward. We then constrain a bar to slide on the rails toward the lightbulb in this magnetic field. How fast do we have to move the bar to put a voltage difference of 3.0 V across the bulb? In what direction does the current flow?

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We have the electromotive force E (V) induced in a wire of length L traveling at velocity v (m/s) in a magnetic field of strength B (T) is:

E ...

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