Ok... so I know the direction of the force is east, the direction of the velocity is north, and the Magnetic field is out of the page. So Im trying to determine what charge this particle is. The answer is positive but I dont see how that's the answer. Look through my work please, to see whats wrong. My work.... My fingers point to the velocity which is north, and I curl into the B-Field, the direction of my thumb, which is out. The Force is still out not east unless I twist my thumb to the east. Then I see the force going to the east.