**3. Judgment (assessment) of the calculations**

If assessing all the calculations for the different parts of the circuits, it becomes evident that it is only one that dominates over all the others, namely the force between the parts of the two circuits aligned along each other at a distance *a* a that is small compared to all the other dimensions of the circuits that are of order *L* , or *a <sup>L</sup>* <sup>→</sup>0. The result is given through Eq. (50), implying an attractive force between these parts of the conductors. The force is furthermore proportional to the length of the conductors and inverse proportional to their mutual distance.
