Statcoulomb: differenze tra le versioni

 

: 1 statC = 0.1 Am/''c'' ≈ 3.3356{{e|−10}} C

 

 

In the electrostatic cgs system, electrical charge is a fundamental quantity defined via the electrostatic force (see below); in the SI system, electrical current is fundamental and defined via the electromagnetic force while electrical charge is a derived quantity. The electrostatic system derives the electric charge from [[Coulomb's law]] and takes the [[permittivity]] as a dimensionless quantity whose value in a vacuum is 1/(4&pi;). Also the use of the [[permeability]] of vacuum, <math> \mu_0 \,\!</math>, is avoided, having the consequence that the speed of light appears explicitly in some of the equations interrelating quantities in this system.