1. The problem statement, all variables and given/known data a beam of particles with velocity v^vector enters a region that has a uniform magnetic field B^vector in the +x direction. show that when the x component of the displacement of one of the particles is 2 * Pi * (m / qB) * vcos(theta), where theta is the angle between v^vector and B^vector, the velocity of the particle is in the same direction as it was when the particle entered the field 2. Relevant equations the period of circular motion is T = 2 * Pi * m / q * B 3. The attempt at a solution if I divide v = d * t = x * t if I choose t to be T then I find v = v cos(theta). then thing is, I don't really undertstand the question, and I want to know how to proceed from there.