1. The problem statement, all variables and given/known data 1) An electron moves in a magnetic field B = .50 i with a speed of 1.0 x 10^7 m/s 45 degrees above the positive y axis. What is the magnetic force on the electron? 2. Relevant equations 3. The attempt at a solution 1)This should be an easy question, but I am getting my signs messed up. F=qvBsin(theta) q = 1.60*10^-6 v= 1.0 * 10^7 m/s B = .50 T F= (1.60*10^-6)(1.0*10^7)(.50) = 8.0 *10 ^ -13 + Now, using the right hand rule I believe that if this were a proton, the components would be (-5.66*10-13)i + (5.66*10-13)k and so then I just flipped the signs: (5.66*10-13)i - (5.66*10-13)k , but my book says they are both negative. Please help, I am confused by this. Is there a better way to think about this?