Advanced theory of electricity and magnetism; A text-book for colleges and technical schools (1915)
Franklin, William S. (William Suddards), 1863-1930, MacNutt, Barry, 1878-1936. joint author · New York, Macmillan · leaf 53
indicated by * The bar magnet being very long and slim so that the small portion of thesphere which is inside of the bar at b may be neglected. 42 ADVANCED ELECTRICITY AND MAGNETISM. the lines of force in Fig. 35, Z is the number of wires lying length-wise on the outside surface of the armature,… … Fig. 35. it cuts all of the magnetic flux $ which enters the armature corefrom the north pole of the field magnet. The time of one revolu-tion of the armature is i/«th of a second, and the time requiredfor a wire to move from a to b in Fig. 35 is i/2wth of a second.Therefore, dividing $ (the amount…
Electricity · Magnetism
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