For steady state in free space, the differential form of these equations in cgs is
where
is the divergence,
is the curl,
is the constant pi,E is the electric field, B is the magnetic field,
is the charge density, c is the speed of light, and J is the vector current density.
In MKS, the equations become
where
is the permittivity of free space and 
is the permeability of free space.
(1)
(2)
(3)
(4)
where
is the divergence, is the curl, is the constant pi,E is the electric field, B is the magnetic field, is the charge density, c is the speed of light, and J is the vector current density.In MKS, the equations become
(5)
(6)
(7)
(8)
where
is the permittivity of free space and is the permeability of free space. 
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