1. The problem statement, all variables and given/known data The problem statement is on the attached file. 2. Relevant equations Lorentz force law maybe. 3. The attempt at a solution My teacher actually did this, by calculating the radius of the circle that the particle would orbit to find the momentum using the cyclotron equation. But I would like to ask if there are other methods than just this one. My curiousity comes the fact that since I could remember how my teacher did it, I became curious on whether other approaches to the problem could be taken. Could you for instance integrate over the force to get the total change in momentum? I tried this but came in trouble, because v is unknown. So yes, is it possible to do this problem in other ways than using the cyclotron equation?