A charged cloud system produces an electric field in the air near the Earth's surface. A particle of charge -2.6 10-9 C is acted on by a downward electrostatic force of 3.0 ✕ 10-6 N when placed in this field.
(a) What is the magnitude of the electric field?
(b) What are the magnitude and direction of the electrostatic force Fel exerted on a proton 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?
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