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 85
s equal to the total quantity of electrification within if. 62 GENERAL THEOREMS [42 We may observe, in the first place, that if a charge q is placedat the point o (Fig. 29), and if a cone of indefinitely small solid angle dta be supposed to startd.R/ JYn from this point, the fluxd,A/J y^ within… … Fig. 29. The flux is therefore but further D- D„dS= : -i-i and dA — r^da qdd iTr and is independent of the distance /•—that is to say, of the positionof the point a. Let us now draw in the field an imaginary, wholly convexsurface (that is to say, a purely geometrical surface, and not thesurface of…
Electricity · Magnetism
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