Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 382
the circle subtends the solidangle 27r(l - cos6); hence the potential at this point becomes dV on- a^^^dx dx F- 2TrnC{l - cosO), and the field is F= 2TvnG -^ since sin^ = - and — rd9/dx = -. At the centre we have r = a and therefore F=27r?iO/a. Thus at the centre of a circle of10 centim. radius the… … manner the strength of the field at each point. Fig. 219 representsthe field of a circular current; the plane of the circle is supposed 360 ELECTRO-MAGNETISM [263- horizontal and perpendicular to the plane of the figure which itintersects at the two small circles on the line ab. The dottedlines…
Electricity · Magnetism
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-237-146.webp)
