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Problem 14 - Olympiad

An α-particle and a proton enter the same magnetic field with the same kinetic energy. The ratio of their radii of curvature is

Correct: A

r = √(2mK)/(qB). r_α/r_p = √(m_α/m_p)·(q_p/q_α) = √4·(1/2) = 1:1.