The Discovery of Induced Electric Currents Volume 12

The Discovery of Induced Electric Currents Volume 12

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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. 1900 edition. Excerpt: ...were out of the electric circuit. 228. Then the wire A was connected with the mercury on the extremity of the magnet, the wire B still remaining in contact with that in the jar (Fig. 36), so that the copper axis was altogether out of the circuit. The magnet was again revolved screw fashion, and again caused the same deflection of the needle, the current being as strong as it was in the last trial (227), and much stronger than at first (22(5). 229. Hence it is evident that there is no discharge of the current at the centre of the magnet, for the current, now freely evolved, is up through the magnet; but in the first experiment (226) it was down. In fact, at that time, it was only the part of the moving metal equal to a little disc extending from the end of the wire B in the mercury to the wire A that was efficient, i. e., moving with a different angular velocity to the rest of the circuit (258); and for that portion the direction of the current is consistent with the other results. 230. In the two after-experiments, the lateral parts of the magnet or of the copper rod are those which move relative to the other parts of the circuit, i. e., the galvanometer wires; and being more extensive, intersecting more curves, or moving with more velocity, produce the greater effect. For the discal part, the direction of the induced electric current is the same in all, namely, from the circumference towards the centre. 231. The law under which the induced electric current excited in bodies moving relatively to magnets, is made dependent on the intersection of the magnetic curves by the metal (114) being thus rendered more precise and definite (217, 220, 224), seems now even to apply to the cause in the first section of the former paper (26); and by...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236984439
  • 9781236984432