A Geophysicist Measures the Magnetic Force Exerted on a Proton $\vec { B }$

A geophysicist measures the magnetic force exerted on a proton that is moving vertically downward at a point 1.996 km/s at Earth's equator.At that location,Earth's $\vec { B }$ field is horizontal and has a magnitude 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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1.3 × 10^-20 N...

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