Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 179
that theN-pole turns. The fingers point in the direction that the currentflows. This rule also holds good if the compass is abovethe wire and the right hand below it, Fig. 138. 171. Magnetic Field of a Circular Wire Carrying aCurrent.— Exp. 52 : Arrange a circular turn of wire vertically and in the…
Electricity · Magnetism
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