10%) Problem 8: Earth has a net charge that produces an electric field of approximately 150 N/C downward at its surface. D $ 33% Part (a) What is the amount of excess charge on the Earth, noting the electric field of a conducting sphere is equivalent to a point charge at its center, in coulombs? Grade Summary 6.78 * 10-1 Deductions 3% Potential 97% sin cos() tan( 7 8 9 HOME Submissions cotan( asin() acos() E 4 6 Attempts remaining 4 (1% per attempt) atan( acotan() sinh( 3 detailed view cosh( tanh() cotanh() + END 1% O Degrees O Radians BACKSPACE DEL CLEAR 1% W N 1% Submit Hint Feedback I give up! Hints: 1% deduction per hint. Hints remaining: 3 Feedback: 1% deduction per feedback * 33% Part (b) What magnitude of acceleration, in meters per second squared, will the field produce on a free electron near Earth's surface? a=295 # 1013 a = 2.950 x 1013 X Attempts Remain