4.4

1

2 12 12

1. ..2

Et / t

P463.1-2P473.1-3

1t,,,2,t,,t.

1/ t2 k=1

nn1 2 E 3

EntE 1.BSSS2-S1EnBSt 2.SBBB2-B1EnSBt 3.BSEnBSt

;

1500.5Wb/s 21000. 5s0.01Wb0.09Wb310010cm20. 5s1T9T

5( )A0BDCDD0D0.4VABD

E abBabvtS=L(vt)=BS=BLvtV

vB 1L2VB=0 E=03VE. VE.

BLabBvLabE=BL(Vsin)E=B(Lsin)V---

RB VE=E = B2RV---

1 E

2

10 E2v E

V .

NS

, . ,,.

50R992021100TsR

dnmqmgd/nq

17911876