Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 353
magnet shouldsupport a permanent weight in order to re-tain its magnetism. By gradually increasingthis load a magnet may ultimately be madeto support a weight far greater than it woulddo at first. When contact is broken, owingto the weight being too great, the carryingpower falls most frequently… … Fig. VMk 238] LIFTINGv POWER 331 to A in absolute value, the attraction for each unit of surfaceis 2irA^ (45). For the total surface of contact S, the force indynes is 27r^l-AS, and if P is the number of grammes whose weightwould just pull off the keeper, we have— gP=27rA~8=~. OTT If we take A =…
Electricity · Magnetism
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