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Question
Earth has a net charge that produces an electric field of approximately 150 N/C downward at its surface. (a) What is the magnitude and sign of the excess charge, noting the electric field of a conducting sphere is equivalent to a point charge at its center? (b) What acceleration will the field produce on a free electron near Earth's surface? (c) What mass object with a single extra electron will have its weight supported by this field?
1. $-6.77\times 10^{5}\textrm{ C}$
2. $2.63\times 10^{13}\textrm{ m/s}^2\textrm{ upwards}$
3. $2.45\times 10^{-18}\textrm{ kg}$
Solution Video