Two parallel circular conductors both carry the current

in the same direction. The circles lie parallel to the

-

plane and both have radius

. The centers of the circles are at

and

. According to the cylindrical symmetry the observation points in the

-

plane can be taken at

. Each circular conductor is parametrized by the angle

, running from

to

. The three quantities

,

,

are displayed for the five independent variables

,

,

,

,

. The observation points are described by

,

and the source by

,

,

. Units used are in the CGS system