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 earths center cubed, so that it can be written as Bar earth r 3 where r is distance from earths rotation axis and Bo =/ gavers 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 possible