A Proton,which Moves Perpendicular to a Magnetic Field of 0

Multiple Choice

A proton,which moves perpendicular to a magnetic field of 0.60 T in a circular path of radius 0.080 m,has what speed? (q_p = 1.6 × 10−¹⁹ C and m_p = 1.67 × 10−²⁷ kg)

A) 9.2 × 10⁶ m/s
B) 4.6 × 10⁶ m/s
C) 9.6 × 10⁶ m/s
D) 3.4 × 10⁶ m/s