Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 103
et poles.Such a coil is shown in Fig. 67. 106. Permeability. — Thenumber of magnetic lines pro-duced inside a solenoid, withan air core, can be greatly in-creased by introducing a pieceof iron, even though the cur-rent in the winding of the so-lenoid remains constant. Thisis due to the fact that… … Fig. 67 ELECTROMAGNETISM 93 number of lines per unit of area for an air core, which isthe field strength, designated by (H), is called the permea-bility, designated by (fi). fi = - (73), H The permeability of a given sample of iron is not constantbecause the value of (j8) does not increase at the…
Electrical engineering
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