A proton moves through a magnetic field at 35.7% of the speed of light. At one location, the field has a magnitude of 0.00637 T and the proton's velocity makes an angle of 135° with the field.
Use c = 2.998 × 108 m/s for the speed of light and e = 1.602 × 10-19 C as the elementary charge.
What is the magnitude Fe of the magnetic force acting on the proton at that location?