Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 234
include n turns then 224 ELECTRICITY [CH. XV I = 2w7rr and the force is then proportional to 2mrifr. Ineither of these cases lines of magnetic force are producedwhich stream through the coil and are linked with it. Let the coil be placed in a vertical plane, and fix ahorizontal sheet of card or… … Fig. 142. in which the dotted lines are lines of force, the strong linesequipotential surfaces. The lines could be mapped out onthe sheet by means of a little compass-needle as describedin Section 71. In doing this it must be remembered that the magnet isalso acted on by the earths magnetism. 147.…
Electricity · Magnetism
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