... 1, 25 1,3 1, 35 H " " " 76 90 110 (AIm) 132 1" 220 '00 ,"0 '00 900 8(T) 1,' 1, 45 1 ,5 1 ,55 1,' 1, 65 1,7 H 1200 2000 ,000 450 0 ... tu IrllOng trong m~ch ICt. EJap sIS: Fm = 1 950 A 1 R", = 6,68.1(J5 H q,= 2,917.1£t3Wb B= 1, 458 T H= 154 7 ~ m 45 t6'e v = 20!!!. -thAng g6e v6i phlIong tt:r ... 11 = 150 0110, c6 ti~t di~n ngang S = 120cm2, chi~u ~ai I =. 5Ocm Uri giai : Tli tra cua dOl,ln ml,lch til ill : I .50 .10-2 4 I Rm = -= =2,21.10 -J,1S 150 0.471:.10-7.120.10-4...