1. , N =3 . ?
: E 1 = kQ / r 12, k = 9*109 ∙2/2, Q , r 1 ; E 2 = kQ / r 22, r 2 = Nr 1 - . 1 2, 1/ 2 = (r 2/ r 1)2 = N 2 = 9.
2. , q, W . Q, C, d. . l , ?
: m , 
. U = Q/C, E = U/d = Q/Cd. , a = EQ/m = Qq/Cdm. 
. at 2/2 , d /2: d /2> at 2/2 → d > = Qql 2/2 CdW, : 
3. C U. A 1 , ? A 2 ?
: . q = CU, q = (CU)/ 2. , A 2 = U ∆ q = U(q - q) = -(CU 2)/2. (q )2/(2 C) q 2/(2 C) = A 1 + A 2. q = q /2, C = C /2 A 2, A 1 = (CU 2)/4.
[1]
Q.1. A B. , x, .
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Q.2. 1,67 3,34 20 . , , -0,67 , ? .
●Q.3. 9 . , ?
Q.4. , + Q - Q, +2 Q. , , .
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Q.5. 40 - 5 . .
Q.6. , , . , ? ?
Q.7. : - q m Q M l . E , a? ?
●Q.8. Φ , Q 1 = 5 Q 2 = -2 .
●Q.9. , p = 10-9 ∙ r = 25 , .
●Q.10. r = 5 λ = 14 /. , , A, a = 10 .
●Q.11. , σ 1 = 2 /2 σ 2 = 4 /2. : 1) ; 2) . , .
●Q.12. R 1 = 5 R 5 = 8 . Q 1 = 2 Q 5 =-1 . , : 1) r 1 = 3 ; 2) r 2 = 6 ; 3) r 3 = 10 . E (r).
Q.13. . . , 0,5∙10-8 .
Q.14. 6,7 -13,4 5 . , 3 4 .
Q.15. σ = 4 /2, 1 1 . , .
Q.16. , 0,5 1 , 4 . .
Q.17. l . , , , , .
●Q.18. , , , λ = 2 /. E r = 1 .
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●Q.19. λ = 1 /. , r 1 = 1,5 r 2 = 1 ?
●Q.20. r = 5 Q =10 . φ : 1) ; 2) , , , a = 10 .
Q.21. ( ) σ 1 = 3∙10-8 /2 σ 2 = 6∙10-8 /2?
Q.22. a = 10 . 10-7 /. , 10 .
Q.23. 20 λ =1 /. , A 10 , q =10-8 , A.
Q.24. E φ .
Q.25. R, Q.
●Q.26. . , φ 0 200 , , r = 50 , 40 .
●Q.27. , λ = 50 /. r = 0,5 .
●Q.28. , σ = 1 /2. , x 1 = 20 x 2 = 50 .
Q.29. , λ . , y , .
Q.30. E , ρ -ρ, l.
Q.31. Q 1, Q 2, Q 3 , Q 1 = Q 2 = 10 . . E max φ max, r = 1 , a 10 .
Q.32. 6,7 13,4 40 . , 25 ?
Q.33. , λ = 0,1 /. φ , , .
●Q.34. R = 5 , σ = 1 /2. , r 1 = 10 r 2 = 15 .
●Q.35. R = 10 , ρ = 20 /3. , r 1 =2 r 2 = 8 .
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●Q.36. E 0 = 700 / (ε = 7). : 1) ; 2) ; 3) ; 4) .
Q.37. R =1 , λ =20 /. , a 1 = 0,5 a 2 =2 .
Q.38. v 0 , , r min, , 10-11 .
Q.39. q - q. a. .
Q.40. φ = α (xy z 2). E a = i +3 k M (2,1,-3).
Q.41. x y E = a (x i + y j)/(x 2 + y 2), a , i j OX OY. R .
Q.42. , r = 1 α -, p =1,5∙10-32 ∙. β .
Q.43. , , , ?
●Q.44. (ε 1 = 7) d 1 =1 (ε 2 =2) d 2 = 0,5 . : 1) ; 2) , U = 500 .
●Q.45. d =5 , U = 1,2 . : 1) ; 2) , , , χ = 1.
Q.46. U 1 = 500 . S = 200 2, d = 1.5 . (ε = 2). U 2 . C 1 C 2 .
●Q.47. , - 
λ 1 λ 2, a . a?
Q.48. . , x 1 = 1 , x 2 = 4 , α - 2∙105 3∙106 /. .
Q.49. a λ p. a, , .
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Q.50. 1 4∙10-5 , . , T = 4,9∙10-4 H. , , 10 .
Q.51. , R, λ = 10 /. E φ , O, . l 1/3 15 .
●Q.52. d = 1 , r 1 = 0,5 , r 2 = 1,5 . U = 1 .
●Q.53. U = 300 . , (ε = 7).
Q.54. , , 800 /3. , . ε = 2.
Q.55. R 1 = 1,5 λ 1 = 0,20 /. R 2 =3 λ 2 = -0,15 /. (ε =3). , : 1) r 1=1 ; 2) r 2 = 2 ; 3) r 3 = 5 .
Q.56. E 0 = 700 / (ε = 7). : 1) ; 2) ; 3) .
Q.57. ρ =5 /3 R = 10 ε = 5. r 1 = 5 r 5 = 15 .
●Q.58. (ε = 3) R = 5 ρ = 10 /3. , .
●Q.59. E 0 = 700 / (ε =7) d = 1,5 S = 200 2. : 1) ; 2) , .
●Q.60. U = 100 . S = 200 2, d = 0,5 , (ε =2). .
Q.61. , 1,5 , (ε =2) 5 . .
Q.62. q l , . ε. : 1) r q ; 2) .
Q.63. , , ?
Q.64 ,
.
Q.65. ,
.
Q.66. .
Q.67. R 1 < R 2, ε = a/r, a , r .
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Q.68. 1000 φ 1 = 1 . φ , ?
●Q.69. C , . C 1 = 1 .
Q.70. C ε. ( ) , C?
Q.71. , C.
Q.72. . a, h. a << h.
Q.73. d . S. A B, , .
Q.74 
. CAB - , - A B.
Q.75. 
A B .
