Notes on electricity and magnetism. designed as a companion to Silvanus P. Thompson's Elementary lessons (1891)
Murdock, J. B. (Joseph Ballard), 1851-1931, Thomson, Silvanus Phillips, 1851-1916 · New York, Macmillan & Co. · leaf 14
cesacting on it, taken around itsaxis, is then zero. The momenttending to bring it back intothe meridian is the force mHinto the arm BC, or mlHsm 6,m being the strength of mag- Cr-net pole and / the distance be-tween the poles. The momentof the deflecting couple is fmx DE, or fml cos S, / beingthe… … Fig. 1. NOTES ON force on a pole at the centre, / = . Substituting this value of / and equating the moments of the forcesaround A mlH sm 0= ml cos 0 .-. C = —— i/tan 0.iitn This formula shows not only that currents vary as thetangent of the angle of deflection, but gives the value ofthe currents in…
Electricity · Magnetism
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