College Physics Volume 2

College Physics Volume 2

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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. 1911 edition. Excerpt: ...of sparks, each weaker than the preceding, may be obtained from a strongly charged jar. 400. Influence of the Dielectric upon Capacity. The influence of the dielectric upon the capacity of a condenser (Art. 316) may readily be shown by means of the condensing electroscope. Let the instrument be charged while the upper plate is connected to the earth and supported a few centimeters above the lower plate. If now a dielectric sheet, as a plate of glass, sulphur or parffine, be introduced between the plates, the divergence of the gold leaves decreases, showing that the potential has decreased. Since the charge has not changed, the capacity of the condenser must have increased, owing to the substitution of the dielectric plate for air. Upon the withdrawal of the dielectric plate, the gold leaves assume their former positions. 401. Electrostatic Energy. If an insulated conductor, originally without charge and at zero potential, be charged by placing upon it a series of small charges, its potential will rise in proportion to the charge, until it finally reaches the value V, when the total charge q has been placed upon it. By making the steps quite small, the process of charging may be made practically uniform. It is obvious that the average potential during the time of charging is V, and that the work W expended in charging the conductor is the same as if the total charge q had been carried from a point of zero potential to one of potential V. From equation (419) we have in this case W=Vq = = t (434) In a similar manner the work necessary to charge a condenser with a quantity Q to a difference of potential V1--V2 may be considered as the work necessary to carry the charge from one plate of the condenser to the other, the average difference more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236867181
  • 9781236867186