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7.
7.4.
, , , , . , . , l . , (. 7.11, ). , . . , , . . , . , (. . 7.11, ). , ,
?h, F1 = 2F = F1h = 2Fh. (7.4.1) ( ) . S1 Un1 = 2σS1( . Un2 = 2σS2, S2 h. , A = Un2 - Un1 = 2σS2 - 2σS1 = 2σ(S2 - S1).
S2 - S1 = lh,
A = 2σlh. (7.4.2) (7.4.1) (7.4.2), 2 Fh = 2 σlh. , l, F = σl. (7.4.3) ( , . . 7.11, ).
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