Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 503
of 27rradius a is —; the length of wire being 27ra, the field due to unit-length of the wire, or the specific effect, is — , and therefore or varies inversely as the square of the radius. We are thus led todiminish as much as possible the radius of the windings and there-fore the length of the… … 360] SHAPE OF COIL 481 for, if it were otherwise, there would be an advantage in trans-ferring some of the wire from the position which it occupies toanother wliero the specific effect is greater. This leads to theadoption for the meridian section of the coil of a figure approxi-mately like that…
Electricity · Magnetism
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