. Electricity simplified. The practice and theory of electricity ... F^wL Fig. 15.—Experiment ShowingLines of Force Surrounding anActive Conductor. Fig. 16.—Diagram op Linesop Force Surrounding anActive Conductor. less marked; and if a piece of such substance beplaced in the path of lines of force, a portion ofthem will crowd together into it, leaving their normalpaths through the air for the better medium, iron,nickel, or cobalt. This is because the metals inquestion have high permeance for lines of force. THE MAGNETIC CIRCUIT. 81 Lines of force must go from somewhere to some-where. In the ca
. Electricity simplified. The practice and theory of electricity ... F^wL Fig. 15.—Experiment ShowingLines of Force Surrounding anActive Conductor. Fig. 16.—Diagram op Linesop Force Surrounding anActive Conductor. less marked; and if a piece of such substance beplaced in the path of lines of force, a portion ofthem will crowd together into it, leaving their normalpaths through the air for the better medium, iron,nickel, or cobalt. This is because the metals inquestion have high permeance for lines of force. THE MAGNETIC CIRCUIT. 81 Lines of force must go from somewhere to some-where. In the case of a magnet they go in a generalsense from pole to pole, as shown in the cut. Theyare assumed, in the case of a magnet, to also gothrough the metal itself. They do not in this case. Fig. 17.—Use of a Compass in Tracing Lines of Force. all emerge from the poles. A multitude of linesstart from all parts of the magnet and enter at cor-responding points on the other side of its centre orneutral point. They may be traced by a small com-pass whose needle tends always to lie parallel with aline of 82 ELECTRICITY SIMPLIFIED. Every line, therefore, can be traced through a cir-cuit. The magnet with its lines of force representswhat is known as a magnetic circuit. As magneticpolarization cannot be imparted to iron withoutcreation of both north and south poles, and as a lineof force starting from a north pole must return to asouth pole, no magnetic lines of force can be estab-lished without the formation of a magnetic circuit. Here a difference from electrostatic lines of forceappears. Every electrostatic charge k bound—thatis, has an opposite and equal charge—somewhere. Tothis its lines of force go; but there is no circuit, thereis only a connection. Lines of
Size: 1695px × 1474px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidel, booksubjectelectricity
