Circular Motion of Charges: Alpha particles, each having a charge of +2e and a mass of 6.64 ×10-27 kg, are accelerated in a uniform 0.50 T magnetic field to a final orbit radius of 0.50 m. The field is perpendicular to the velocity of the particles. What is the kinetic energy of an alpha particle in the final orbit? (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C)
A. 3.0 MeV
B. 2.6 MeV
C. 3.4 MeV
D. 3.9 MeV
E. 4.3 MeV
Answer: A
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