Rreq R,
R ³ Rreq
R, 2×/, ,
R=d/l,
d - , .
Rk, 2×/,
Rk=R1+R2+...+Rn+Ra.l,
R1, R2,..., Rn - , 2×/;
Ra.l - , 7 [2].
R, 2×/,
R=Rsi+Rk+Rse,
Rsi=1/aint, aint - , /(2×), 7 [1];
Rse=1/aext, aext - , /(2×), 8 [2].
, , ( ).
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a) , . : I II; II III.
, , A1 = 1a, A2 = 1(l a).
7 [2] Ra.l δa.l = a, , Q ta.l .
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b) IV V, , .
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