Definitions for abcoulomb
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a unit of electrical charge equal to 10 coulombs
a unit of electromagnetic charge equal to ten coulombs
The abcoulomb or electromagnetic unit of charge is the basic physical unit of electric charge in the cgs-emu system of units. One abcoulomb is equal to ten coulombs. CGS-emu units are one of several systems of electromagnetic units within the centimetre gram second system of units; others include cgs-esu, Gaussian units, and Lorentz–Heaviside units. In these other systems, the abcoulomb is not one of the units; the statcoulomb is instead. In the electromagnetic cgs system, electrical current is a fundamental quantity defined via Ampère's law and takes the permeability as a dimensionless quantity whose value in a vacuum is unity. As a consequence, the square of the speed of light appears explicitly in some of the equations interrelating quantities in this system. The definition of the abcoulomb follows from that of the abampere: given two parallel currents of one abampere separated by one centimetre, the force per distance of wire is 2 dyn/cm. The abcoulomb is the charge flowing in 1 second given a current of 1 abampere.
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