International Library of Technology · Scranton, International Textbook Co. · leaf 108
around each loop will coincide withthose around the adjacent loops, forming several long linesof force which thread through the entire helix, entering atone end and passing out through the other. The same con-ditions now exist in the helix as exist in a bar magnet;namely, the lines of force pass… … Fig. 942. position and free to turn, it will come to rest pointing in anorth-south direction. A helix made in this manner around which a current ofelectricity is flowing is called a solenoid. The polarity of a solenoid or the direction of the lines offorce which thread through it depends upon the…
Electrical engineering
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