The electrostatic force between two protons separated by a distance d is

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The electrostatic force between two protons is significantly larger than the gravitational force between them. This is because the electrostatic force, governed by Coulomb's law, is much stronger at the atomic and subatomic levels compared to the gravitational force, which is described by Newton's law of universal gravitation. The gravitational force is the weakest of the four fundamental forces, especially at the scale of particles like protons.

The Electrostatic Force Between Two Protons Separated by a Distance