Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 102
tion of the iron,and I, the length of the magnetic path in the ring. We will assume that the permeability jjl is constant, which is approxi-mately true for low values of the induction, for which B is roughly propor-tional to H. If, now, the currentof / absolute units increases by■ an amount dl in… … Fig. 83 These lines cut T turns in thetime dt. The electromotive forceof self-induction thereby produced was seen in Section ^3 to opposewhatever change of current produced it. Since d^ represents, as before. 88 Electrical Engineering an increase in the number of lines, we must put a negative sign…
Electrical engineering
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