Walker, Halliday & Resnick — Coulomb's Law: Problem 4

4 (a) What is the magnitude of the electrostatic force between a singly charged sodium ion (\(Na^+\), of charge \(+e\)) and an adjacent singly charged chlorine ion (\(Cl^-\), of charge \(-e\)) in a salt crystal if their separation is \(2.82 \times 10^{-10} \text{ m}\)? (b) What is the force magnitude if radiation removes another electron from the sodium ion?