The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 58
line of force which leaves ^ in a direction perpendicularto AB is bent through an angle of 30° before it reaches its asymptote atinfinity. The sections of the equipotentials made by the plane of xy for this caseare shewn in fig. 16 which is drawn on the same scale as fig. 15. The equa-tions of… … PlG. 16. Indeed the conditions quence of the fact that C is a point of equilibrium,for a point of equilibrium, namely 3j:=o ^-1^=0 ?i^=o OX oy oz may be interpreted as the condition that the equipotential (F= constant)through the point should have a double tangent plane or a tangent cone atthe…
Electricity · Magnetism
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