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Electrostatic physics question?

How far apart must two point charges of 55.0 nC (typical of static electricity) be to have a force of 3.40 N between them?

mm

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  • Anonymous
    11 months ago
    Favorite Answer

    Electrostatic force is

    F = k q^2 / r^2

    then

    r = q (k / F)^1/2

    where

    k = 9x10^9 Nm^2/C^2 [Coulomb constant]

    then

    r = 5.5x10^-8*(9x10^9 / 3.4)^1/2 = 2.83 mm

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