The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 44
o of the normals away from ^ (thoseat Q, Q in fig. 8) are outward normals to the surface, while the third normalaway from P^ (that at Q in the figure) is an inward normal—or it may 42] Gauss Theorem 35 cut five, seven, or any odd number of times. Thus a cone through a smallelement of area dw on a… … Fig. 8. occur will contribute —e^dw and -^^ e^dw respectively, the fourth and fifth ifthey occur will contribute — eidoa and -\-e^da) respectively, and so on. Thetotal contribution from the cone surrounding dco is, in every case, + e^doi.
Electricity · Magnetism
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