Chegg Guided Solutions for Essential University Physics Volume 2 2nd Edition: Chapter 20

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    Coulomb’s law for electric force and Newton’s law for gravitational force both are Inverse Square dependence.

    In microscopic level, the electric force between individual particles is stronger than the gravitational force. However in macroscopic level, the gravitational force dominates the electric force. Since most of the matters are neutral, they have equal number of electrons and protons.

    Thus, they should cancel positive and negative charges in bulk matter, which becomes neutral.

    Moreover the electrons in one object attract the protons in the second object and at the same time the electrons in second object also repel the electrons in first object. Hence, the electric force becomes weaker as matter consists of largely of electrons and protons. Therefore, gravity becomes important on the macroscopic scale.

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