Elementary treatise on electricity and magnetism (1903)
Foster, George Carey, 1835-1919, Joubert, Jules François, 1834-1910. Traité élémentaire d'électricité, Porter, Alfred William, 1863- joint author · London, New York, Longmans, Green, and co. · leaf 49
ffect of such a sphere at an external point p,join p and the centre o (Fig. 17), and take p on op so that op . OP = -R2, S being the radius, and let p be the vertex of a cone of very smallsolid angle, do), which intercepts infinitesimalareas, A and A, at the surface of the sphere.Putting r for pa… … Fig. 17. we get, for the areas A and A,r^doi respectively, and from the relation — = - -^ -^ iJ OP r^dd) and-cos a cos a. Put s = PA and s = pa : then the electric forces at P due to thecharges on A and A are r^ut 1 1 rMio 1cos a K s^ cos a K a- being the uniform surface-density of the charge; but,…
Electricity · Magnetism
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