A Charged Particle Moves in a Region of Uniform Magnetic

Multiple Choice

A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms) . What is the speed of the particle as it moves along this path?

A) 0.13 km/s
B) 0.10 km/s
C) 0.16 km/s
D) 0.23 km/s
E) 0.06 km/s