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TAP 519- 2: Measuring the momentum of moving charged particles Analysing the motion of a charged particle in a magnetic field can lead to a determination of its momentum. Measuring the momentum of moving charged particles velocity v force F circular path, radius r magnetic field B into screen charge q velocity v motion in circle magnetic force m v2 = force F r force F = qvB m v2 = qvB r p = mv = qrB at relativistic speed p = qrB is still true but p > mv Momentum of particle proportional to radius of curvature of path Practical advice This diagram is here so that you can discuss it with your class. External reference This activity is taken from Advancing Physics chapter 16, 140O