Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 76
t T 1+. 47r.r./ - cos a = -—1 . cos «! (41)- „ /■+«. 27r.r.7 . , 27r.r./| H = — I 5 .sina.da = I I For very long solenoids cos «i is practically equal to i, so that 47r.T.r H = I .(42 If the current be expressed in amperes, this formula becomes H = •(43)- If the unit pole be placed at the centre of… … Fig- 54 As before, if the solenoid is very long, a^ is very small and cos a^ can betaken as unity. The field strength at the ends is thus half that at the middle,and of the total number of lines passing through the middle of the solenoida half passes through the ends while the other half leaves by…
Electrical engineering
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