, r , : dj = - Jrdr (1); j - , J- ; r - . r 4pr2 aa , I, . J = I/4pr2. j, (1) r ¥ j ( j = 0 r ¥). : j = rl /4pr. -j. . , j , . 0. j : j = rI /4pr1 - rI/4pr (2), r1 r - . l , , r1 . j r, a . 1 :
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j = rIlcos a /4pr2 +rIl2(3cos2 a- 1)/8pr3 + G (4), G , l3/r4, l4/r5 .. , , l/rn. . ( ). 4. , r>> l, 4 . . , l 0. 4 . (f0) . , r , f0 : f0 = r å Dj cos aj / 4Pr2. (D0) , D0 = å Dj. . , : f0 = r D0 cos a / 4Pr2, a - D0 ; D0- D0.