The book The Electromagnet And Electromagnetic Mechanism was written by author Silvanus Phillips Thompson Here you can read free online of The Electromagnet And Electromagnetic Mechanism book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Electromagnet And Electromagnetic Mechanism a good or bad book?
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86. FIG. 87. ELECTROMAGNET WITH MULTIPLE CORES. MULTIPLE CORES AND SINGLE CORE. three iron cores were each 3 inches in diameter, and the layer of winding J inch thick, the (average) length of wire required to put one turn round one core will be almost exactly 1 1 in. ; or, to put one turn round the whole section of iron, the length required will be 33 in. If, however, the wire is simply carried once round all three cores, as in Fig. 8/#, the length needed will be only 27 in. If the same amount ...of iron were fused into one large cylinder of the same section, having therefore a diameter of 5 196 in. , the (average) length of wire required for one turn will be only 19 '05 in. It becomes, therefore, in order to save copper, an im- portant question what is the best form of section to give to Relation of Resistance. 209 cores. This point is readily answered by considering the geometrical fact that of all possible forms enclosing equal area the one with least periphery is the circle. For facilitating comparison, the following table exhibits the relative lengths of wire required to wind round various forms of section enclosing equal area ; the area of the simple circular form being taken as unity : Circle ..
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