Lessons in Elementary Practical Physics Volume 2 - Bookswagon
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Lessons in Elementary Practical Physics Volume 2

Lessons in Elementary Practical Physics Volume 2


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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. 1887 Excerpt: ...for we have respectively C = Hrtana (4) and Ci=Hrtano!.... (5) where a and a are the angles of deflection observed. Inserting these values in (3), there results E = HrrxlO- tanatnai.... (6) tan o-tan ai This will give the value of E in C. G S. units, since for this purpose the value of the resistance in ohms must be multiplied by 109. But since also one volt = 108 C. G. S. units, the value of E in (6) must therefore be divided by 108 in order to reduce its value to volts. Hence finally-r, ..... HIV tan a tan ai 109 lOHrr tan a tan ai, . E (in volts) =--7 x TTs =--i 1!. (7) tan a-tan oi 10 tan a-tan oi Method.--Make a circuit consisting of the galvanometer provided with a commutator, the box of coils, and the battery arranged in series. Take sets of double readings with varying resistances, and calculate out the values of E from different pairs of observations. Example.--The coil of the standard galvanometer used, consisted of a single turn of thick copper TJT inch thick. The inner diameter of the hoop was 22-5 inches, and the hoop itself was inch thick. Hence the radius of the copper strap was 11-5 inches. Therefore a 11-5x2-539 where 2-539 is the multiplier which converts inches into centimetres. The value of H had been previously determined by the magnetometer and found to be-17 C. G. S. units, so that-17xll-5x2-539--.? Hi-2x1x3-1416-7y?-Two Grove's cells provided with a commutator were connected with the copper strap by means of adynamic leads; that is to say, leading wires so twisted together that they had no direct effect upon the galvanometer when they conveyed a current. A box of resistances of the values-5, '2, "2, and-1 ohms, made of thick German silver wire, was also in circuit. It was found that the current did not perceptibly heat...


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Product Details
  • ISBN-13: 9781152371934
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 116
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1152371932
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 222 gr

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