Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 160
lts) will be required. 17. We have to send a current through a telegraph line, 100 mileslong, the resistance of which is 13 ohms per mile. The battery iscomposed of Daniell cells, each having an E. M. F. of 1.079 volts andan internal resistance of 2 ohms. The telegraphic instrument offersa… … Fig. 235. 330 MAGNETISM. 19. Give two or three differences between electric attractions andrepulsions and magnetic attractions and repulsions. 20. A zinc and a copper plate are respectively united by copperwires to the terminals of a galvanometer. They are dipped, side byside, into a glass…
Electricity · Magnetism
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