Earth's Atmosphere It is found experimentally that the electric field in a certain region of Earth's atmosphere is directed vertically down. At an altitude of 270 m the field has magnitude 60.0 N/C; at an altitudeof 170 m, the magnitude is 100 N/C. Find the amount of charge contained in a cube 100 m on edge, with horizontal faces at altitudes of170 and 270 m. Neglect the curvature of Earth.