Winch, Ralph P. Formerly, Department of Physics, Williams College, Williamstown, Massachusetts.
- Additional Readings
For electrostatics, Coulomb's law states that the direct force F of point charge q1 on point charge q2, when the charges are separated by a distance r in free space, is given by F = , where k0 is a constant of proportionality whose value depends on the units used for measuring F, q, and r. It is the basic quantitative law of electrostatics. In the International System (SI) of units, k0 = 1/(4πε0), where ε0 is called the permittivity of empty space and has the value 8.85 × 10−12 farad/m. Thus, Coulomb's law is as in the equation below
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