1. The problem statement, all variables and given/known data A solid conductor travels at 150 m/s across a uniform .045T magnetic field. Which side is positively charged and what is the emf across this block? 2. Relevant equations I actually solved for the emf no problem. I am having difficulty determining which side is positively charged. There is a diagram which accompanies the question. It can be found in this pdf file (first question): http://pittmath.com/Physics12/Ultimate%20Induction%20Review%20Assignment.pdf [Broken] if you can't open it, the diagram simply shows a rectangular block with a velocity to the left going through a magnetic field going out of the page. The question asks if the positive side of the rectangle is the top or the bottom. 3. The attempt at a solution I was told to use the right hand rule, but I'm not clear which one or even what I'm looking for. If you could help that would be greatly appreciated.