Alpha Particles,each Having a Charge of +2e and a Mass $\vec { B }$

Alpha particles,each having a charge of +2e and a mass of 6.64 ×10^-27 kg,are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m.The $\vec { B }$ field is perpendicular to the velocity of the particles.How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10^-19C)

A) 0.15 μs
B) 0.25 μs
C) 0.33 μs
D) 0.40 μs

Correct Answer:

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