About the magnetic field of the Helmholtz ring system

It is shown that derivatives of the same order with respect to all spatial variables of the magnetic induction vector at the central point of the system of Helmholtz rings are proportional to each other, i.e. the uniformity of the magnetic field of the system is the same in all directions. An expansion of the projections of the magnetic induction vector at this point up to the 8th order into a Taylor series in all spatial variables has been obtained.