The earth is continuously bombarded by cosmic rays of high energy. using measurements performed predominantly composed of protons. the average energy of these protons was found to be of the order of a few 109 ev (1 ev 1.6 x 10-19 j). the radiation intensity was found to be about 1 proton per square centimetor per oecond. assume that initially the eau th had no each proton colliding with the earth surface is absorbed, i. e. contributes to the increase of the total charge of the earth. estimate the order of magnitude value of the time required for the cosmic rays to increase the electric potential of the earth to such a value that the protons could not anymore reach its surface due to the electrostatic repulsion. the earth radius is rearth 6350 km. (4 points) on satellites, it was established that they are charge and