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A Treatise on Telegraphy; Answers to Questions: (English)

A Treatise on Telegraphy; Answers to Questions: (English)

          
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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...rt: r: 1: 6.08, or r2 = 6.08 r, . Substituting 14 for r r = 6.08 X 14 = 85.12 ohms per mile, the resistance of the iron wire. As the resistance of the conductor is proportional to its length (Art. 2292), then, by formula 406, the resistance of 1,000 feet of the iron wire is 85.12 X 1,000, ..., . r. = =-rx = 16.1212 ohms. Ans. 5,280 Note.--In the two cases, as the diameters of the wires are equal, their sectional areas are also equal; therefore, the sectional areas can be neglected in solving the problem. See Art. 2293. (1166) The sum of the currents in the three branches is 7.7 + 23.9 + 15 = 46.6 amperes. The difference of potential between the point where the branches divide and the point where they unite is by formula 411 = C R = 46.6 X 3.2 = 149.12 volts. To find the resistance of each branch, consider each branch separately and apply Ohm's law; therefore (Art. 2310), coulombs. Transposing formula 405, The separate resistance of branch A is E 149.12 (1167) From formula 430, the intensity of magneto., .., 3.192 X a-t 3.192 X 4,620., _, A, motive force is H =-. =----= 1,474.704. Ans. A magnetic density of 1,474.704 lines of force is produced in a magnetic circuit when H = 1,474.704; therefore, the total number of lines of force in the circuit is equal to the product of the magnetic density and the sectional area, or 1,474.704 X 3.2 = 4,719.0528 lines of force. Ans. (1168) The area of the surface of the sphere = diameter' X 3.1416 = 4 X 4 X 3.1416 = 50.2656 sq. in. From Art. 2225, the electric density of a charged body is found by dividing the number of units of electricity by the area of the surface upon which it resides; therefore, the electric density of the sphere is 400-r-50.2656 = 7.9577 units of electricity per sq. in. Ans. (1169) Fr...


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Product Details
  • ISBN-13: 9781130875768
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 50
  • Series Title: English
  • Weight: 109 gr
  • ISBN-10: 1130875768
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 189 mm


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