Statcoulomb
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In physics, a statcoulomb is the unit of electric charge in the cgs-esu (centimeter-gram-second electrostatic system) of units. A point charge has magnitude one statcoulomb, if it repels a point charge of equal magnitude at a distance of 1 centimeter with a force of one dyne. One statcoulomb is 10/c coulomb, where the coulomb is the SI unit of charge and c is the cgs speed of light (c ≈ 3⋅1010 cm/s).