. Practical physics. Fig. 303. Field ofmasnet alone Fig. 304. Field ofcurrent alone Fig. 305. Field of magnetand current field above the wire is now the sum of the two separate fields,while the strength below it is their difference. Now Faradaythought of the lines of force as acting like stretched rubberbands. This would mean that the wire in Fig. 305 would bepushed doivn. Wliether the lines of force are so conceived ornot, the inotor rule may be stated thus: A current in a magnetic field teyids to move away from theside on ivhieh its lines are added to those of the field. The dynamo rule foll
. Practical physics. Fig. 303. Field ofmasnet alone Fig. 304. Field ofcurrent alone Fig. 305. Field of magnetand current field above the wire is now the sum of the two separate fields,while the strength below it is their difference. Now Faradaythought of the lines of force as acting like stretched rubberbands. This would mean that the wire in Fig. 305 would bepushed doivn. Wliether the lines of force are so conceived ornot, the inotor rule may be stated thus: A current in a magnetic field teyids to move away from theside on ivhieh its lines are added to those of the field. The dynamo rule follows at once from the motor rule and Lenzs law. Thus, when a wire is moved through a magnetic field the current induced in it must be in such a direction as * The cross in the conductor of Fig. 304, representing the tail of a retreat-ing arrow, is to indicate that the current flows away from the reader. A dot,representing the head of an advancing arrow, indicates a current flowingtoward the reader. 294 INDUCED CURRENT
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
