Hi, I was wondering if you can help me with the following question. I am totally stuck. I'm not sure I even understand the question. Any help or hint would be greatly appreciated! This is the problem: Over a region where the vertical component of the earth's magnetic field is held in an east-west direction and moved horizontally to the north with a speed of 10m/s. Calculate the potential difference between the ends of the wire, and determine which end is positive. End Problem. I copied the above question verbatim, and I'm still trying to figure out what it means as it is worded strangely. I assume they're saying that the earth's magnetic field is directed east-west and the wire is moving north at 10 m/s, perpendicular to the field. I think this has something to do with motional emf, and the equation V = Blv plays some role. However, B and l are not given so I don't know. And the right hand rule probably has something to do with figuring out which end is positive. That's all I can deduce. What do you think? Thank you so much for your time.