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“abcoulombs”

The unit of electric charge in the electromagnetic centimeter-gram-second system, where one abcoulomb is equal to 10 coulombs.

In the electromagnetic cgs system, electrical current is a fundamental quantity defined via AmpĂ¨re's law and takes the permeability as a dimensionless quantity (relative permeability) 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.