Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 296
258. The bar electro-mairnet … 309. The electromagnet. Let acore of soft iron be inserted in the helix(Fig. 258). The poles will be fonnd to beenormously stronger than before. This is because the core is magnetized by induction from the field of thelielix in piecisely the same way in which, it would be magnetized byinduction if…
Physics
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