210
. .
, . , , . , .. .
, , .
, , . - - ( , , ). , , . , , ( ) , . , .
, I 2 , ε, , ..
ε = / ./| dl | Cos(E.,dl),
E - .
, I 2, , .
= / ./| dl | Cos(E.,dl),
, .- .
. , .. .
.
, .. . , , , .
, , , ..
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U12= ε +
J R, ..
U12= J R12= ε +
= 0, R12=R=r - , r - ( ), R- , ..
ε = J (R+r)= J R+Jr=U.+U.
- .
(.1) , R = Rv - . :
U.=JRv=ε-Jr, .. (U.= JRv) U.= Jr.
, Rv>>r (, ), Jr 0, .. . , , .
2. . .2.
.2
ε ε r rx R=Rx + R1 (Rx R1 - ) G RG.
J, Jo, Jx . ε < ε, R , G , G . G
Jx (rx + RG ) + J Rx = ε
JG =0,
J Rx = ε. (1)
, ε , , , . .
ε εN /' RN. (1)
J RN = εN. (2)
(1) (2),
ε = εN Rx / RN. (3)
εN , , ( - , ), , Rx, RN εN ε. , .
. -, . , . , . -, ε . , , .
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