A Charged Particle (Q = 1

Multiple Choice

A charged particle (q = 1.6 *10^-19 C) enters a mass spectrometer with a speed of 2.5 * 10⁶ m/s. The magnetic field in the spectrometer, 0.25 T, produces a circular motion of the charged particle of radius 2.5 cm. The mass of the charged particle is

A) 1.0* 10^-28 kg.
B) 2.0 *10^-28 kg.
C) 3.0 * 10^-28 kg.
D) 4.0 * 10^-28 kg.