A proton (with mass mp = 1.67 x 10^-27 kg, charge qp = 1.6 x 10^-19 C) moving with a speed of 0.80 x 10^5 m/s, enters the Earth's magnetic field (B = 55.0 μT, Northbound). If the proton is shot eastward, the magnetic force acting on it should be
Group of answer choices
8.08 x 10^-16 N downward
7.04 x 10^-19 N Westward
7.04 x 10^-19 N upward
7.04 x 10^-19 N downward