A Proton,mass 1

Multiple Choice

A proton,mass 1.67 × 10−²⁷ kg and charge +1.6 × 10−¹⁹ C,moves in a circular orbit perpendicular to a uniform magnetic field of 0.50 T.Find the time for the proton to make one complete circular orbit.

A) 8.7 × 10−⁸ s
B) 1.3 × 10−⁷ s
C) 9.8 × 10−⁷ s
D) 4.3 × 10−⁸ s