2.73 ( ). m 1 = 100 , m 2 = 100 . . , . .
2.74 1 V 0. 106 .
2.75 640 0 C. .
2.76 
, , 
100 ?
2.77 
. .
2.78 2 . 
.
2.79 
. .
2.80 
. 
.
2.81 1 , 
?
2.82 
, 
.
2.83 m , 
, . .
2.84 , 
3 
3? .
2.85 
2 , 
, . F, . d, .
2.86 
. 
. .
2.87 . 
, .
2.88 
, 
?
2.89 
. , .
2.90 
. 
, . .
3.1 Q1 = 20 , Q2 = 10 d = 5 . . , r 1 = 3 r 2 = 4 . F, Q = 1 .
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3.2 Q1 = Q2 = Q3 = 2 = 10 . F, .
3.3 Q 9 Q d = 100 . . , , , , . , , , , .
3.4 . 
. . 
, ? 
/3, 
= 2,2.
3.5 Q 1 = Q 2 = Q 3 = Q 4 = 40 = 10 . F, .
3.6 Q 1 = 30 Q 2 = 20 d = 20 . , r 1 = 30 , r 2 = 15 .
3.7 = 10 . Q 1 = 10 , Q 2 = 20 Q 3 = 30 . F, Q 1 .
3.8 Q 1 = Q 2 = Q 3 = Q 4 = 8×10-10 . Q , ?
3.9 d = 20 : Q 1 = 50 Q 2 = 100 . F, Q 3 = 10 , , d.
3.10 d Q 1 = 2 Q 2 = 4 60 . , Q 3 , . Q 3 . ?
3.11 m = 1 , . l = 10 . , a = 60?
3.12 Q 1 = 100 Q 2 = 50 d = 10 . F, Q 3 = 1 , r 1 = 12 Q 1 r 2 = 10 Q 2.
3.13 Q 1 = Q 2 = Q 2 l = 10 . , , , , .
3.14 . r , ?
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3.15 , , m = 1 Q = 1 . a , , s = 40 / 2?
3.16 l = 20 
/. , , = 20 . .
3.17 Q = 0,2 . , , r = 20 . R = 10 .
3.18 R = 10 Q = 50 . , , .
3.19 , , 
/. , , = 20 .
3.20 R = 20 . 
/ . , , h = 2R .
3.21 R 2 R 
(. 1). : 1) , (r) : I, II, III. = 4 
, = 
; 2) , r, 
. = 30 /2, r = 1,5 R; 3) (r).
3.22 . 3.21. .1 s 1 = s, s 2 = s. .2 s = 0,1 /2, r = 3 R
3.23 . 3.21. .1 s 1 = 4 s, s 2 = s. .2 s = 50 /2, r = 1,5 R.
3.24 . 3.21. .1 s 1 = 2 s, s 2 = s. .2 s = 0,1 /2, r = 3 R.
3.25 s 1 s 2 (. 2). : 1) , () : I, II III. s 1 = 2 s, s 2 = s; 2) , , ; 3) ().
1
2
3.26 . 3.25. .1 s 1 = 4 s, s 2 = 2s. .2 s = 40 /2 .
3.27 . 3.25. .1 s 1 = s, s 2 = 2 s. .2 s = 20 /2 .
3.28 R 2 R s 1 s 2 (. 3). : 1) : (r) : I, II III. s 1 = 2 s, s 2 = s; 2) , r, . s = 50 /2, r = 1,5 R; 3) (r).
3
3.29 . 3.28. .1 s 1 = s, s 2 = s. .2 s = 60 /2, r = 3 R.
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3.30 . 3.28. .1 s 1 = s, s 2 = 4 s. .2 s = 30 /2, r = 4 R.
3.31 
d = 60 . , ?
3.32 , 
300 . Q = 0,2 1 2 (. 4).
4
3.33 Q 1 = 2 Q 2 = 2 , = 10 . . , Q = 0,5 1 2 (. 5).
5
3.34 , s 1 = 2 /2 s 2 = 0,8 /2, d = 0,6 . . U .
3.35 = 100 × = 200 /. , a = 180 .
3.36 , j = 10 , . j 1 ?
3.37 R = 10 . t = 800 /. j , h = 10 .
3.38 = 200 ×. U , r = 40 .
3.39 , t = 20 /. U , r 1 = 8 r 2 = 12 .
3.40 t = 200 /. j .
3.41 q = 100 = 10 . .
3.42 , s = 1 / 2. , x 1 = 20 x 2 = 50 .
3.43 R = 8 , r = 10 / 3. , r 1 = 10 r 2 = 15 .
3.44 R = 8 , t = 10 /. , r 1 = 2 r 2 = 7 .
3.45 R = 5 , s = 1 / 2. , r 1 = 10 r 2 = 15 .
3.46 (t = 10 /). Ek 1 , l 1 = a , , l 2 = 2 a Ek 2 = 200 .
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3.47 , Ek = 10 , . , U = 8 ?
3.48 ++ +, .
3.49 Ek = 400 ( ) R = 10 . , , Q = 10 .
3.50 , , v = 105 /. d = 8 . : 1) U ; 2) s .
3.51 = 5 , N = 10, U = 1 . Ek ? v ?
3.52 vmin , , R j = 400 B, , l = 3 R ?
3.53 = 200 / ( ) v 0 = 2 /. l, , .
3.54 = 200 , Q = 40 , . U = 200 v = 10 /. v 0 , .
3.55 . 
1 = 100 v 1 = 6 /. 2 , .
3.56 , , v 1 = 1000 / v 2 = 3000 /. .
3.57 q 1 = q 2 = 50 r 1 = 1 . , r 2 = 0,5 ?
3.58 v = 3 / E = 150 /. . t = 0,1 .
3.59 , v = 8 /?
3.60 , , v 0 =104 /. , ?
3.61 1 = 5 2 = 10 U 1 = 60 U 2 = 100 . , .
3.62 1 = 10 U = 10 . , , , 2 = 20 .
3.63 1 = 2 , 2 = 5 3 = 10 U = 850 . .
