An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 115
the needle is increased. (See Fig. 48.) If thetwo branches are equally near the needle, they act upon it withequal force, and thus the total force on the needle is doubled.By coiling the wire about the position of the needle, each ad-ditional turn will cause an additional deflecting force. Inthis… … Fig. 49. Loose solenoid with its linesof force. rent near it depends upon the strength of the current. We now see that when a current is coiled around a point, the force depends upon the strength of the current multiplied by the number of turns in the coil. This product of the current by the turns…
Electricity · Magnetism
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