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A charged cloud system produces an electric field in the air near the Earth's surface. A particle of charge -2.2 10-9 C is acted on by a downward electrostatic force of 3.0 10-6 N when placed in this field.

(c) What is the magnitude of the gravitational force Fg on the proton?

(d) What is the ratio Fel / Fg in this case?

(I found the electric field is 1363.636 N/C, and the electrostatic force Fel is 2.185E-16 already, these are question a) and b) of this problem.)


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