A Proton Travels Through a Potential of 1

Multiple Choice

A proton travels through a potential of 1.0 kV and then moves into a magnetic field of 0.040 T. What is the radius of the proton's resulting orbit?

A) 0.080 m
B) 0.11 m
C) 0.14 m
D) 0.17 m
E) 0.19 m