winding supports s as 1 and s as 2 with s as 1 having five loops from s 1 to s 5 laid out in the same way as in fig3 b and with s as 2 having three loops disposed so that the external loop is further from the center than the external loop of the winding as 1 in this case the inductance l 1 of the coil pack p 1 or subassembly 102a may readily be determined by the addition of the partial inductances of as 1 and as 2 and of the mutual inductance between as 1 and as 2 since this arrangement may be varied this constructional flexibility allows any desired value of l i to be obtained on each single coil pack p i or subassembly 102 and therefore enables any desired total inductance value from the series of n inductances l 1 l n of the n coil packs p 1 p n or subassemblies 102 comprising the completed air core coil modular assembly 100 in addition there are practically no limits with regard to the number of coils p i or subassemblies 102 because the winding supports s as the holding members c sas the spacing members di and the shields sch are all extremely light and of reduced size such as a weight of 10 g and an overall size of 10 u00d7 10 cm and because of their modular arrangement are relatively easy to assemble by means of through bolts 1 2 3 4 and the associated nuts 1 39 2 39 3 39 4.