I'm studying for the Physics SAT Subject Test using The Princeton Review (2011-2012). There's this motional EMF problem about a rod sliding to the right along a u-shaped wire in a uniform magnetic field that's going into the page and the current moving counter clockwise. Problem is: I can't figure out why the current is going counter clockwise. It seems to me that the magnetic force would push electrons in the rod downwards, creating a negative end on the bottom. Therefore, current would go from positive to negative so it would be clockwise, right?