Charles Augustin Coulomb

Charles Augustin Coulomb (1736-1806), French physicist, belonged to the high aristocracy. Military engineer, was disconnected from the army in 1791 and, during the French Revolution, was forced to take refuge outside Paris.

His early work in physics were still geared to engineering and mechanics. Coulomb wrote the book The theory of simple machines, which earned him entry into the Academy of Sciences of France, and established the law that relates the friction force and the normal to the surfaces in contact.

His most notable contribution to physics, however, is connected to electricity. In 1784, Coulomb began a series of careful experiments using a special, very sensitive balance (see illustration) to discover the relationship between the strength of interaction between electrically charged bodies, the charge contained in each
and the distance between them, reaching the expression F=kq1.q2/d²

As Priestley had predicted, the expression of Coulomb's law is exactly the same as the Newton's Law of Universal Gravitation . Physicists are convinced that this similarity is not coincidental, but the relationship between these laws has not yet been established. 

Although Coulomb has not been the first to propose this law, it got its name because it was he who managed to prove it indeed with extraordinary skill and precision.

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Prof. Sergio Torres

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