Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 141.—Attraction of Magnetic Body (B) by theCurrents Field. 162 PRACTICAL ELECTRICITY. »t ClocltvviteSoutt. Po2d»ity Fig. 142.—Polarity of a Single Turn of Wire. lines emanate again from the more distant face, that face isof N-polarity. The single turn of wire, therefore, possessespolarity similar to a bar magnet, and when free to move will take up a position inthe earths field, withits N-face pointingtoward the N ; also,its N-face will be re-pelled by the N-poleof a bar mag
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 141.—Attraction of Magnetic Body (B) by theCurrents Field. 162 PRACTICAL ELECTRICITY. »t ClocltvviteSoutt. Po2d»ity Fig. 142.—Polarity of a Single Turn of Wire. lines emanate again from the more distant face, that face isof N-polarity. The single turn of wire, therefore, possessespolarity similar to a bar magnet, and when free to move will take up a position inthe earths field, withits N-face pointingtoward the N ; also,its N-face will be re-pelled by the N-poleof a bar magnet, orsimilar loop, and at-tracted by the magnetsS-pole, according tothe law of attractionand repulsion betweenmagnets. When the current is sent the opposite way aroundthe single turn, B, Fig. 142, the direction of the whirls is re-versed and the lines now emanate from the nearer or N-faceof the loop, and enter by the more distant S-face. The po-larity of the loop is, therefore, reversed as compared with theprevious case. The aboveprinciples may be demon-strated by Exp. 53. // Exp. 53: Fasten a piece ofcopper and zinc to a large cork, s*Connect the plates by a circular i\turn of heavy wire, Fig.
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