A First Book of Electricity and Magnetism for the Use of Elementary Science and Engineering Students and General Readers

A First Book of Electricity and Magnetism for the Use of Elementary Science and Engineering Students and General Readers

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...is a permanent magnet, by turning its poles round the other way. The left-hand rule may also be applied to predict the direction of the induced currents in the experi ments illustrated in Figs. 105-108. In Fig..105, think of the tuft of lines proceeding from the N. pole of the magnet, and the direction in which they cut the first turn of the coil. In Fig. 106, imagine an end view of the wires a b and c d; figure to yourself the circular lines spreading out from a b and collapsing again, when the primary or inducing circuit is respectively made and broken, and think of the direction in which they cut the wire c d. In Fig. 107, the linesof-force due to coil A are practically the same shape as if A were a bar magnet; and having found the polarity of one end of A by one of the rules given in 106, A may be looked upon as a bar magnet. Then the direction of the currents induced in B may be predicted as in the case of the experiment illustrated in Fig. 105. When the coils are one within the other (Fig. 108), one may think of the lines spreading out from and collapsing into coil A when the circuit is respectively made and broken, and the direction in which these lines cut the outer coil B. In experiment (f), when the iron core is inserted, many additional lines spread out from the inner coil and cut the outer coil. When the core is withdrawn, these extra lines collapse, and again cut the outer coil. The opportunity occurs here for the reader to sketch out some more or less original diagrams to illustrate the above remarks. 135. Practical Applications of Induction. The practical applications of induction may be roughly divided into two classes: --(a) Those in which E.M.Fs. are induced in a coil or coils of wire by moving them in magnetic...show more

Product details

  • Paperback | 84 pages
  • 189 x 246 x 4mm | 168g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123680922X
  • 9781236809223