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Why is the gravitational force usually ignored in problems involving particles such as electrons and protons?...

Why is the gravitational force usually ignored in problems involving particles such as electrons and protons? a). The electric force between charged particles is much greater than the gravitational force. b).Subatomic particles are too small to experience gravitational forces. c). Charged subatomic particles only experience electric forces. d). The distances between subatomic particles are too small. e). Protons and electrons obey quantum mechanics. Gravity does not work at the quantum level.

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Gravitational force is the force between two masses separated by a distance and electric force is the force between two charges separated by a distance. The gravitational force between electron and proton is small. The electric force between electron and proton is large. Gravitation force is always attractive and the electric force either repulsive or attractive So, the electric force between charged particles electrons and protons is much greater than the gravitational force. Hence, correct option is (a).

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