OK, so I forget the exact problem, since it was on a test, but here's basically what it stated. 1. The problem statement, all variables and given/known data There's a magnetic field pointing directly into the page. A vertical rod, perpendicular to the magnetic field, is placed in it and is moved with a velocity v to the right. Then, they show you a bunch of rods moving in different direction (but in the same plane of the paper). They ask you 'which one will produce the greatest voltage between both ends of the rod.' I don't have pictures, since it was a test question, but what is bothering me is how a moving rod in a magnetic field can produce a voltage in the first place. Faraday's law states that V = rate of change of flux, but how is flux changing in this case? The rod is always in the magnetic field so the magnetic flux is always constant. When i did look this up in the book, they 'derived' it by imagining that the rod was attached to a u-shaped loop. As the rod moved to the right, the area of the enclosed region would increase, thus increasing flux. But I don't see how this applies to a separate rod of metal. Thanks!