Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 28
n placed in this field isrepelled by the pole N and attracted by the pole S, the lines offorce, being drawn in the direction ofthe force on a north pole placed in thefield, must leave the N pole and enterthe S pole. The total number of lines of forceleaving or entering a magnetic pole iscalled its… … Fig. 4. 5. Lines of Force from a Unit Pole.—If a unit pole were surrounded by asphere of 1 cm. radius, as in Fig. 4, another unit pole placed on the surface ofthis sphere would be acted on with unit force and so the field intensity atthis surface must be unity; there must therefore be one line of…
Electrical engineering
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