Electric Field of a Point Charge
Calculate the electric field strength and electric potential at a distance from a point charge, free online.
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The field of a point charge is E = k·q ÷ r² (pointing away from a positive charge) and the potential is V = k·q ÷ r, with k = 8.9875×10⁹ N·m²/C². The force on a test charge q₀ is F = q₀E.