The force of attraction between positive and negative charges.

It is easy to calculate the force between two charged particles using Coulomb's law. If the charges on the particles have opposite signs, the force will be one of attraction. If the charges on the particles have the same signs, the force will be one of repulsion.

F = kq_{1}q_{2}/r^{2}

F is force, in newtons

k is known as Coulomb's constant. k's value depends on the medium around the charged objects. In air, k is approximately 9.0 x 10^{9} Nm^{2}C^{-2}.

q_{1} is the charge on the first particle, measure in Coulombs.

q_{2} is the charge on the second particle, measure in Coulombs.

r is the distance between the particles, in meters.

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