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is the elecrostatic force: 3 Nk is the constant for Coulomb's law ≈ 9.00 × 10⁹ N . m² / C²d is the distance that separate the centers of the charges
are the values of the charges: ≈ ± 1.6 × 10⁻¹⁹ C
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How far apart are a proton and electron if they exert an attractive force of 3n on one another...
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