, . [1].
, , ( ).
:
f = f(I1/ I2),
I1, I2 - , .
[1].
, ( ) ( ).
(. 11). N S . . , - R1 R2. , , . . ( , - ), .
( ). R1 R, R2 Rt. I1 I2 , :
M1= c1B1I1; M2 = 2B2I2,
1 2 - , ; B1 2 [1].
R = Rt, I1 = I2, . . . .
Rt ( ), , , . , , , . , , . , .
1=2 :
.
Rt I1/I2. , 2/1 I1/I2.
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(. 12) R1 R3, R2 () Rt. 2Rnp Rt. ( ), - [1].
. 12. . ( )
, , I = 0. b d , I R1 R3, R1 R3 :
R1I1 = R3I3. (1)
bc cd :
I2R2 = It(Rt + 2Rnp). (2)
(1) (2),
. (3)
I = 0, Ii = I2 I = It (3)
R1 (Rt + 2R) = R2R3.
:
, , 2Rp . (4)
Rt R2.
, , .