Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 219
249. Why an Electromagnet is More Powerful than aHelix Without a Core. When the iron core is inserted intothe coil a greater number of lines of force pass from end toend through it, because the permeabiHty of iron is very muchgreater than that of air. The effect of the core, therefore, isto…
Physics
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