The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 57
The same result can be seen in another way. If we start from A anddraw a small tube suiTOunding the line AB, it is clear that the cross-sectionof the tube, no matter how small it was initially, will have become infiniteby the time it reaches the plane which bisects ^5 at right angles—in factthe… … Fig. 15. At a great distance R from the points A and B, the fraction PB - PAPB + PA vanishes to the order of 1/jK, so that except for terms of the order of l/i^^ Thus at infinity the lines of forcebecome asymptotic to straight lines passing through the origin. Let us suppose that a line of force…
Electricity · Magnetism
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