1. . (. 126) +s
(s = dQ/dS , ).
. 126
. , , . (cosa = 0), , ( En E), . . 2ES. , , sS. (81.2), 2ES = sS/e0,
(82.1)
(82.1) , , . . , , ..
2. (. 127). + a a. , . , . ( ), E = 0. = + + _ (+ E_ (82.1)),
(82.2)
. 127
, (82.2), , , .
3. . R Q + s. , , . (. 128).
. 128
r, . > R, Q, , , (81.2), 4pr2E = Q/e0,
(82.3)
r>R r , . E . 129. r¢ < R, , ( = 0).
. 129
4. . R Q r ( - , ). (. . 3), , , (. (82.3)). . r' < R G' = 4/3pr¢3r. , (81.2), , ,
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(82.4)
, (82.3), / (82.4). . 130.
. 130
5. (). R(. 131) t ( - , ).
. 131
, . r l. ( ), 2pr l E. (81.2), r > R 2pr l E = t l /e0,
(82.5)
< R, , E = 0. , (82.5), .