Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 170
e consideration will show that if a current be carried below a needle in one direc-tion, and then back in the oppositedirection aiove the needle, by bendingthe wire round, as in Fig. 79, theforces exerted on the needle by bothportions of the current will be in thesame direction. For let a be… … CHAP. in.J ELECTRICITY AND MAGNETISM. 153 retreats ; while the current flowing above, which alsodeflects the N.-seeking pole to its left, will equally urgea towards the observer, and b from him. The needlev/ill not stand out completely at right-angles to thedirection of the wire conductor, but…
Electricity · Magnetism
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