What is Coulomb’s Law?

Coulomb’s Law describes the strength of the electrical force between two charged objects. The formula is F = k (q1 q2/r2), where k is a constant equal to 9.0 x 109 Nm2/C2 (newton-meters squared per coulombs squared). The charges q1 and q2, measured in coulombs, represent the charges on the objects that cause the force F, measured in newtons. Finally, r is the distance between the centers of the two charged objects. A negative force is an attractive force, while a positive force is repulsive.


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