ELECTRICITY IN LOCOMOTION - BOOK

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ELECTRIC TRACTION ON MAIN LINE RAILWAYS

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On tramways, automobiles, and 'third-rail' lines, the electric current used belongs to the type described as 'continuous' or 'direct,' because the flow is always in the same direction. The other type of current is known as 'alternating,' as it flows backwards and forwards many times per second. There are several kinds of alternating current—single-phase, two-phase, three-phase, and polyphase—each produced from generators designed in a particular way. It is not possible to give any adequate account of these different kinds of alternating current without going rather deeply into the theory of electricity. The ultimate practical point is that in transmitting alternating currents the circuits increase in number with the phases. Thus, three-phase current requires three wires, two-phase current three or four wires, and single-phase current a single circuit like that of continuous current . Fig. 12. Photograph of a train on the electrif...
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Solution : Field on the axis of a circular opening of a plane - corrected exercises Gauss theorem

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∎ Back to exercise     The Load distribution can be seen as the result of the superposition of an infinite plane of a surface density of charge s and a disc with a density - s. The field at a point M of the axis  according to the principle of superposition is the vector sum of the fields created by each of these distributions taken separately. Either:   Noting the unit vector normal to the plane and oriented to the point M, z the coast of the point M from the center of the circular opening ,we have , using conventional demonstrated results in progress (demonstrate need to know!): Finally : ∎ Back to exercise ∎ See the list of electromagnetism exercises
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