Emf in a conducting rod moving away from a wire with current I

[Mauvai]

Homework Statement

A conducting rod of length l moves with a constant speed v perpendicular
to an infinately long, straight wire carrying a current I. What is the emf generated between the ends of the rod when it is a perpendicular distance r from the wire?

Homework Equations

no idea whatsoever

The Attempt at a Solution

sorry completely lost on this one :-/

 

[Mauvai]

And i realize this looks like i haven't tried, but I've checked every set of notes, every piece of background reading provided, posted on my years facebook page, googled it, and absolutely nothing has come up.