Im having a really hard time with these...I have three different problems so here they are.. Situation one: Particle moving up, field moving to the right. Thus the force has to be either into or out of the page so to speak because it has to be perpendicular. Through the right hand rule I got that the force would be out of the page, not sure if its right. Situation two: Field goes right, particle is going off at an angel A which appears to be about 210 degrees. Thus to be perpendicular the force is either going to be at 120 or 300 degrees. I used the right hand rule and got that it would be the 300 degrees. Situation Three: Field goes into the page (not down) and the angle this time goes up what seems 30 degrees. So to be perpendicular it either has to be 120 degrees or -60 (or 300) degrees. I got the 300 again. Really appreciate any help!