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Physics Current Electricity Level: High School

A proton moving at a speed of 3.8 x 106 m/s cuts across the lines of a magnetic field at an angle of 70 degree. The strength of the field is 0.25 x 10-4 T. What is the magnitude of the force acting on the proton ? (qp = 1.6 x 10 – 19C)

a. 5.1 x 10-18 N

b. 9.0 x 10-18 N

c. 1.4 x 10 -17 N

d. 2.3 x 10-17 N