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 74
distance, r, from the point, and determining the value of the integral / —^ for the whole. As a special case, suppose a quantity of positive electricity, (2,concentrated ^t a point, a (Fig. 26), and a quantity Q at a ; the 37] EQUIPOTENTIAL SURFACES 51 potential at any point, p, whose distances… … Fig. 26. about the line aa as an axis, and Fig. 26 represents a section bya plane through the axis of a system . of equipotential surfacescorresponding to the values Q= +20 and Q— -5, the potentialsof consecutive sur-faces differing byunity from eachother. The surfacegiven by the equa-tion r r
Electricity · Magnetism
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