Thank you very much for your help, mfb. You made it clear. I knew about the circular motion, but I didn't know F played such a big part in calculating the radius. I appreciate your help.
I am relatively new to particle physics, and I seem to have reached confusion already. I do not seem to comprehend how you could measure the momentum of a charged particle just by exerting force and a magnetic field on it. The formula F = Bqv is mentioned when I hear of this, which does not...