1. The problem statement, all variables and given/known data A velocity selector uses a 64mT magnetic field perpendicular to a 28kN/C electric field. At what speed will charged particles pass through the selector undeflected? 2. Relevant equations v = E/B 3. The attempt at a solution Using dimensional analysis, I converted units T = kg/(s2 A), N = kg m/s2, and C = A s, and found N/(C T) = kg m s2 A/(A s3 kg) = m/s which would be v = E/B. v = 28kN /(64C mT) = 4.375x105 m/s My question is what is conceptually going on in this problem? Is the orientation of the magnetic field varying to deflect the particles?