Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · 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… … >-*. &MW^ri Mk Fig. 139.—Graphical FieldCurrent.Made with the aid of iron filings.
Electricity · Magnetism
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