In a Mass Spectrometer,a Singly-Charged Particle (Charge E)has a Speed

Multiple Choice

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^-19C)

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