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In fair weather, over flat ground, there may be a downward electric field of 125 N/C.

(a) Assume that the Earth is a conducting sphere with charge on its surface. If the electric field just outside is 125 N/C pointing radially inward, calculate the total charge on the Earth and the charge per unit area.

______ C

______ nC/m2

(b) At an altitude of 220 m above the Earth's surface, the field is only 95 N/C. Calculate the charge density of the air (assumed constant). [Hint: See the Conceptual Example within the chapter that discusses "Field Lines for a Thin Spherical Shell".]

______ C/m3

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