Electro-Dynamics. 135 … Electro-magnets. — In this arrangement the bolt iscalled a core, the coil of wire a helix^ and both togetheran electro-magiiet. The core issometimes bent into a U-shape,so that the magnetic force ofboth poles may be utilized. Morefrequently two iron rods are used(Fig. no) to facilitate the…
Physics
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