  There is a similar behaviour between the toroidal coordinates and the dipole
magnetic field produced by a circular loop. In this work we evaluate up to what
extent the former can be used as a representation of the latter. While the tori
in the toroidal coordinates have circular cross sections, those of the circular
loop magnetic field are nearly elliptical ovoids, but they are very similar for
large aspect ratios.The centres of the latter displace from the axis faster
than the former. By making a comparison between tori of similar aspect ratios,
we find quantitative criteria to evaluate the accuracy of the approximation.
