Items related to Report of the Committee appointed by the British Association...
Report of the Committee appointed by the British Association on standards of electrical resistance; From the Report of the British Association for the advancement of Science for 1863 - Softcover
Synopsis
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. 1864 Excerpt: ...the number of lines passing through the closed surface will be mui; and if C be the strength of the current, the amount of work done by bringing the magnet and circuit from an infinite distance to their present position will be Cmuj. This shows that the magnetic potential of a closed circuit carrying a unit current with respect to a unit magnetic pole placed at any point is equal to the solid angle which the circuit subtends at that point. By considering at what points the circuit subtends equal solid angles, we may form an idea of the surfaces of equal potential. They form a series of sheets, all intersecting each other in the circuit itself, which forms the boundary of every sheet. The number of sheets is 4ir C, where C is the strength of the current. The lines of magnetic force intersect these surfaces at right angles, and therefore form a system of rings, encircling every point of the circuit. When we have studied the general form of the lines of force, we can form some idea of the electromagnetic action of that current, after which the difficulties of numerical calculation arise entirely from the imperfection of our mathematical skill. 24. General Law of the Mechanical Action between Electric Currents and other Electric Currents or Magnets.---Draw the lines of magnetic force due to all the currents, magnets, &c, in the field, supposing the strength of each current or magnet to be reduced from its actual value to unity. Call the number of lines of force due to a circuit or magnet, which pass through another circuit, the potential coefficient between the one and the other. This number is to be reckoned positive when the lines of force pass through the circuit in the same direction as those due to a current in that circuit, and negative when they pass...
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