A proton moving at a speed of 3.8 × 10^6 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? (qp = 1.6 × 10^-19 C)
a. 1.4 × 10^-17 N
c. 9.8 × 10^-18 N
b. 2.3 × 10^-17 N
d. 5.1 × 10^-18 N
C
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