1. The problem statement, all variables and given/known data An electron moves through a uniform magnetic field given by B = Bxi+(3.0Bx)j. At a particular instant, the electron has velocity v = (2.0i+4.0j)m/s and the magnetic force acting on it is (6.4x10-19N)k. Find Bx. 2. Relevant equations Fb=|q|v x B 3. The attempt at a solution B = Bxi + (3Bx)j + 0zk v = 2xi + 4yj + 0zk Fb = 0xi + 0yj + (6.4 * 10^[-19]N)k I'm sure I need a matrix. But i can't figure it out, help!