The mathematical theory of electricity and magnetism (1911)
Jeans, James Hopwood, Sir, 1877-1946 · Cambridge [Eng.] : University Press · leaf 435
S^ i R (2) Fig. 118. 42G The 3Iagnetic Field produced hij Electric Currents [ch. xiii 481. Instead of regarding this field as due to a particle of moment jointlyproportional to the area PQRS and to the current-strength, we may regardit as due to a small magnetic shell, coinciding with the area… … Fig. 119. 482. Next, let us consider the current flowing in a closed circuit of anyshape we please, and not necessarily inone plane. Let us cover in the closedcircuit by an area of any kind having thecircuit for its boundary, and let us cutup this area into infinitely small meshesby two systems of…
Electricity · Magnetism
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