In a Mass Spectrometer, a Single-Charged Particle (Charge E) Has

In a mass spectrometer, a single-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 is 0.020 m. What is the mass of the particle?

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