1. The problem statement, all variables and given/known data A beam of protons traveling at 1.20 km/s enters a uniform magnetic field, traveling perpendicular to the field. The beam exits the magnetic field, leaving the field in a direction perpendicular to its original direction. The beam travels a distance of 1.30 cm while in the field. What is the magnitude of the magnetic field? 2. Relevant equations F = qv ×B dF = Idl ×B 3. The attempt at a solution F = qv x B B = F/qv = F / (1.602 × 10−19) 1.2 stuck as to what equation applies, and where i can find the value of F from.