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 123
one another,all of them passing through acommon centre (Fig. 53). Con- -p^ f^^ sidering a small length dr of the tube at mean distance /■ from this centre, and bounded by sphericalsurfaces of radii r + \(lr and r — Idr, the force along the length ofthe tube on any such spherical surface within it… … d{2->A) DA 2 df that is, a force of amount DA2 2Q dr= — 2pA dr, tending towards the centre. Now A = r^6^; hence this inward force is 2pr6^dr. In order to maintain equilibrium, a stress ^/, the magnitudeof which is to be determined, must be applied at the lateral faces,giving a resultant acting…
Electricity · Magnetism
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