A Proton Moving at a Speed of 3

Multiple Choice

A proton moving at a speed of 3.8 *10⁶ m/s cuts across the lines of a magnetic field at an angle of 40°. The strength of the field is 0.25 *10^-4 T. What is the magnitude of the force acting on the proton? (q_p = 1.6 *10^-19 C)

A) 1.4 *10^-17 N
B) 2.3 * 10^-17 N
C) 9.8 *10^-18 N
D) 5.1 *10^-18 N