The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 59
y 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 point. J. 4 50 Electrostatics—Field of Force [CH. II II. Point charges + e, — e. 63. Let charges ± e be at the points x= ± a (A, B) respectively.… … Fig. 17. III. Electric Doublet. 64. An important case occurs when we have two large charges + e, —e,equal and opposite in sign, at a small distance apart. Taking Cartesiancoordinates, let us suppose we have the charge + e at a, 0, 0 and the charge— e at — a, 0, 0, so that the distance of the…
Electricity · Magnetism
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