Coulomb's Law
Calculate the electrostatic force and potential energy between two point charges, free online.
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Coulomb's law gives the force F = k·q₁q₂ ÷ (ε_r·r²) with k = 8.9875×10⁹ N·m²/C². Like charges repel and opposite charges attract. The potential energy is U = k·q₁q₂ ÷ (ε_r·r).