Let a closed path C pass N times around a current 
(i.e., N is the winding number of the path around the current). Then the line integral of the magnetic field B along the path is given in cgs by
where c is the speed of light and
is the differential length element. Similarly, in MKS,
where
is the permeability of free space.
(i.e., N is the winding number of the path around the current). Then the line integral of the magnetic field B along the path is given in cgs by (1)
where c is the speed of light and
is the differential length element. Similarly, in MKS,(2)
where
is the permeability of free space.
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