. 22, . , () ( ). r .
, n, I, 2, 2 U = const I = const (. 22, ).
n = f(P2), , (29.5), , U : I aS r . (U 1S r), . , , , . 2, n = f(P2) , . , , . 22, . n = f(P2) , , , : , . ., . . n . , ( ) , . , .
. 22. () ()
.., , :
(29.8)
n 0 ..
D n = 2¸8%, .
2 2= 9,55 2/. = const 2 = (P 2) . , 2 = (P 2).
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n = const = 0 + 2. I = const, , .. M 0 = const. = (P 2) 2 = (P 2). = const, 2 = (P 2) I = (P 2), M = c I a.
n = (M) (29.5):
(29.9)
(25.24)
I = /( ), (29.10)
(29.11)
n 0 ..; D n , .
. 23. :
;
;
, ( I = const) = const. , (. 23, ). , , . ( 1). , , ( 2 3).
. , .. 0 D n, . . (29.11). , . . (. 23, ).
U 0, D n . ( ) (. 23, ), . . , .