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A geophysicist measures the magnetic force on a proton that is moving vertically downward at a point 1.996 km/s at the earth's equator. At that location, the earth's magnetic magnetic field is horizontal and has a strength of 0.40 × 10-4 T. What are the magnitude and direction of the force she will measure? (e = 1.60 × 10-19C)
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