The outlines of physics: an elementary text-book . cuit may be similarly compared to the sudden with-drawal of this magnet to a great distance. {d) To show that this form of electromagnetic induction dependsupon the action of lines of force, and increases with the number ofthese, the bundle of wires may be introduced into the inner act, on account of their high permeability, to enable the pro-duction of a greatly increased number of lines of force. When the circuit is closed, all of these lines of force may be con-sidered as having been made to cut the wires of the outer coil. There
The outlines of physics: an elementary text-book . cuit may be similarly compared to the sudden with-drawal of this magnet to a great distance. {d) To show that this form of electromagnetic induction dependsupon the action of lines of force, and increases with the number ofthese, the bundle of wires may be introduced into the inner act, on account of their high permeability, to enable the pro-duction of a greatly increased number of lines of force. When the circuit is closed, all of these lines of force may be con-sidered as having been made to cut the wires of the outer coil. Theresult is a greatly increased deflection. When the circuit is openagain it is as though these numerous lines of force were drawn inagain; cutting the coils in the opposite direction, and likewise pro-ducing a large deflection. 298. Induction Coils. — The foregoing experiment indi-cates the principle upon which the interesting piece ofapparatus called the induction coil is constructed. Thisconsists of an iron core a (Fig. 298) surrounded by a coil.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
