1. (30) Earth's field strength is 1.0 gauss pointing northward at the surface in the plane of the equator. That field drops off with distance from earth's center cubed, so that it can be written as B = Bor where r is distance from earth's rotation axis and Bo = 1 gauss. Is there a distance from earth where a proton can "orbit" the earth being held in orbit by the magnetic force? Show whether or not this is reasonable/possible. Earth