. A text-book of electrical engineering;. rule, requiring less imagina-tive effort, is the corkscrew rule:The directions of current and field^ ^^ are related in the same way as the directions of translation and rotation of a right-handed screw. The action between conductor and pole is naturally mutual. If the poleis fixed and the conductor is movable, the latter will move in a directionat right angles to a plane through conductor and pole. The motion will thusbe at right angles to the plane through the conductor and the lines of forcemeeting it, due to the pole alone. The directio
. A text-book of electrical engineering;. rule, requiring less imagina-tive effort, is the corkscrew rule:The directions of current and field^ ^^ are related in the same way as the directions of translation and rotation of a right-handed screw. The action between conductor and pole is naturally mutual. If the poleis fixed and the conductor is movable, the latter will move in a directionat right angles to a plane through conductor and pole. The motion will thusbe at right angles to the plane through the conductor and the lines of forcemeeting it, due to the pole alone. The direction of motion can be found byAmperes rule, in this case also, if the rule be expressed as follows: If aperson swims with the current and looks toward the north pole,whence the lines of force proceed, the north pole tends to move to theleft. If the pole is fixed, the conductor tends to move to the this form, the rule is applicable to motors, in which a uniform fieldproceeds from a large pole face. In Fig. 42 a conductor, carrying a. 25- Magnetic Effect of a Straight Conductor 53 current in the direction indicated, is in front of a north pole, from whichthe lines of force come out normally to the paper. If we imagine ourselvesswimming with the current and facing the north pole, we see that theconductor will move to the right, as shown by the dotted arrow. Similarly,in Fig. 43 a current-carrying conductor is in front of a south pole intowhich the lines of force enter. If we imagine a swimmer with his head tothe right and feet to the left, looking out from the surface of the paper,his right hand will point in the direction of the dotted arrow and theconductor will therefore move towards the top of the page.
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Keywords: ., bookcentury1900, bookdecade1920, bookidcu3192400440, bookyear1920
