Alpha Particles,each Having a Charge of +2e and a Mass $0.50 \mathrm {~T}$

Alpha particles,each having a charge of +2e and a mass of 6.64 ×10^-27 kg,are accelerated in a uniform $0.50 \mathrm {~T}$ $\vec { B }$ field to a final orbit radius of $0.50 \mathrm {~m}$ The $\vec { B }$ 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^-19C)

A) 3.0 MeV
B) 2.6 MeV
C) 3.4 MeV
D) 3.9 MeV

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