At what speed would a proton need to circle the Earth at a height of 1 000 km above the equator if the Earth's magnetic field is horizontal and directed north-south, with an intensity of 4.00 × 10^?8 T? (The radius of the Earth is 6 400 km and the charge and mass of the proton are q = 1.60 × 10^?19 C and mp = 1.67 × 10^?27 kg. Ignore relativistic corrections.)
2.84 × 10^7 m/s
Physics & Space Science
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Physics & Space Science