A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 226
the line r and the element ds. The absolute unit of current strength in the electro-magneticsystem is defined to be such that if one centimeter length ofthe circuit be bent into an arc of one centimeter radius, thecurrent in it exerts a force of tmit intensity upon a magneticpole of unit strength… … Fig. 19. Action of a circular current on a magnetic pole. Let A C represent the circular conductor bearing the currentwhose intensity is C (Fig. 19), AB or ds an element of this- 212 EXPERIMENTAL PHYSICS. current, and P the position of a magnetic pole of strength fi,supposed placed on CD, the axis…
Physics
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