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en-wikipedia-org-2350		Coulomb's law - Wikipedia			.html	text/html	6828	1196	79	Coulomb's law was essential to the development of the theory of electromagnetism, maybe even its starting point,[1] as it made it possible to discuss the quantity of electric charge in a meaningful way.[3] Based on experiments with electrically charged spheres, Joseph Priestley of England was among the first to propose that electrical force followed an inverse-square law, similar to Newton's law of universal gravitation. This publication was essential to the development of the theory of electromagnetism.[4] He used a torsion balance to study the repulsion and attraction forces of charged particles, and determined that the magnitude of the electric force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Coulomb's law states that the electric field due to a stationary point charge is:	./cache/en-wikipedia-org-2350.html	./txt/en-wikipedia-org-2350.txt