1. The problem statement, all variables and given/known data In 2.2 µs, an electron moves 11 cm in the direction of a 0.07 T magnetic field. The electron's velocity components perpendicular and parallel to the field are equal. What is the length of its actual spiral trajectory and How many orbits about the field direction does it complete? 2. Relevant equations T = 2pir/v = 2pim/qB 3. The attempt at a solution I was thinking of using the period, but the velocity is unknown.