well if i understand this question correctly,
i would say its a mix of volts and field..
volts are providing a electric pressure and also a emiitted field (the condensing of a net charge pos or neg emits a field) .. commonly known as emf.
now as for rodins work the question is..
is there a better geometry of interaction for the potential (volts) and its traveling emf that doesnt degrade the syncronousity of the electron spin and by doing so takes away uneeded disipation from within the coil it self.. which is where all the heat comes from and loss known in todays electric components... not only that but the coils geometry being based off nature it self taps into the dynamics of the electrons flowing in space itself.. all in all as rodin says can create a mini black hole..