A Proton Moving at a Speed of 4

Multiple Choice

A proton moving at a speed of 4.2 × 10⁶ m/s cuts across the lines of a magnetic field at an angle of 78°.The strength of the field is 0.91 × 10−⁴ T.What is the magnitude of the force acting on the proton? (q_p = 1.6 × 10−¹⁹ C)

A) 1.3E-17 N
B) 3.1E-17 N
C) 6.0E-17 N
D) 7.2E-9 N
E) ​9.6E-36 N