In a mass spectrometer, a singly-charged particle (charge e) has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m. What is the mass of this particle? (e = 1.60 × 10-19 C)
A) 3.2 × 10-28 kg
B) 6.4 × 10-28 kg
C) 1.7 × 10-27 kg
D) 4.5 × 10-27 kg
E) 3.1 × 10-31 kg
Answer: B
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