A Particle with a Charge of 1 $\times$ 10^-19 and a Mass of 1

Multiple Choice

A particle with a charge of 1.60 $\times$ 10^-19 and a mass of 1.67 $\times$ 10^-27 kg is found moving in a uniform magnetic field of a strength 1.50 T. The trajectory of the particle is perpendicular to the magnetic field and is circular with a radius of 1.80 cm. The velocity of the particle is

A) 2.6 $\times$ 10⁶ m/s.
B) 2.6 $\times$ 10³ m/s.
C) 2.6 $\times$ 10⁴ m/s.
D) greater than 4.0 $\times$ 10⁶ m/s.