A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.020 T at a right angle to the field. What is the radius of the proton's resulting orbit? (e = 1.60 x 10 C, m = 1.67x 10 kg) Select one: O a. 0.17 m O b. 0.22 m O c. 0.11 m O d. 0.14 m O e. 0.080 m