. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. INDUCTANCES AND RESISTANCES 'air gap'. One effect of this is to make the flux for a given K^NI rather in- dependent of variations of jjl which may occur in the iron, whilst retaining the valuable property of iron as a flux-guide. The magnetic path-length in the arrangement of Figure is not far from 40 cm, whilst the length of the air gap is 2 mm. Let the ^ of the iron be known to lie in the region 800-1,200: the permeability of air is unity: then we have ^ Reluctance. 10 cm Figu
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. INDUCTANCES AND RESISTANCES 'air gap'. One effect of this is to make the flux for a given K^NI rather in- dependent of variations of jjl which may occur in the iron, whilst retaining the valuable property of iron as a flux-guide. The magnetic path-length in the arrangement of Figure is not far from 40 cm, whilst the length of the air gap is 2 mm. Let the ^ of the iron be known to lie in the region 800-1,200: the permeability of air is unity: then we have ^ Reluctance. 10 cm Figure If there were no gap, the reluctance would be proportional to the length of the flux path and inversely proportional to the iron permeability r> 1 . T^ ^iron „ 40 Cm Reluctanccno gap = K^ = Ag /^iron jMiron but with the air gap, by analogy with resistances in series Reluctanccwith gap = ^2 It^^ + ^^^ , t^ivon /"gap! 8 cm 0-2 cm^ ^K, 39-8 but ^air = 1 , f^iTon + 0-2 If, for some reason, fj, changes from 800 to 1,200, the change in reluctance without a gap would be 40 K, 800 Ko 40 T2OO X 100% - 100% = 50% but if fi changes from 800 to 1,200 with the air gap, the change in reluctance, and therefore of flux, is now only /39-8 \ ^2 800+0-2 ^ —V X 100% - 100% K, /39-8 \1200 + 0-2 0-05+ 0-2 p-033 + 0-2 55 X 100% - 100% ^11%. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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