6.
' ', '., C'. - . . , , , , , . , . , - .
' ( ) j , . , : 
, (1)
- , 
- , I - , - , z0 -
. 6.
' ( (j=0), z - j. .
. 1., (x,y,z) (r,0,0), ' (Rcosj0,Rsinj0, Z), j0- . ђ l, l (l2=x2+y2+z2, x2=(Rcosj0-r)2, y2=(Rsinj0)2, z2=z2), :
(R cosj0 - r)2+ (R sinj0)2+ z2=l2
z2=l2-R2-r2+2Rrcosj0=Z02-2Rr(1-cosj0),
Z2=l2-(R-r)2= l2-R2+2Rr-r2.
, j0 cosj0 1-j02/2,
Z2=Z02-Rrj0 (2)
(2), , j
(3)
(3) , 
, (4).
.. Z0=l. , , :
, (5)
j0 - , - , t - . , , : 
(6)
t=0, T/2,T,3T/2, .(.. cos(2p/T) = 1),
, (7)
( (1) (7))
(8)
(8) (4),
(9)
(9) , , .. . (9)
, t>>T, - , t - , ( 2-3 ).
.
r = 0,06 ; l = 0,61 ;
R = 0,12 ; m0 = (0,481+0,01) - .
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