>> . 10-11 .

2.

 


5

1. j l = 10 ρ = 5,5 10-7 , U = 10 .

2. , , q. t = 0 d1 = d0 + υt, d2 = d0 - υt. , .

3. , , I = 5 t = 10 ?

4. d = 0,5 l = 470 U = 1,2 I = 1 . .

5. , t = 10 R = 15 . t1 R1 = 18 . , α = 0,006 -1.

6. AU = 300 /; d = 6 10-2 . , t = 2000 . 0 ρ0 = 5,5 10-7 . α = 0,0046 -1.

7. (, ) , , ?

8. , 220 , , , 110 , . ?

9. m = 1,4 h = 20 . , , I = 40 U = 220 . η = 90%.

10. , t = -10 , τ = 10 , U = 220 I = 3 ? η = 80%. = 2,1 103 /( ), λ = 3,35 105 /.

11. d1 = 1,5 , , τ = 10 V = 1,2 , t = 10 ? η = 60%; d2 = 0,2 ; U = 100 . = 4,2 103 /( ); ρ = 4,2 10-7 O .

12. , l = 1 , = 8 ? U = 130 , β = 8%. ρ = 1,7 10-8 .

13. . t1 = 10 , t2 = 15 . , : ) ; ) ?

14. , 2.39. ' BCD .

15. S , , 2.40, R1 = 80 . R2 . .

16. , 2.41, R1 = 10 , R2 = 40 ; U = 120 . R3, I3 = 2 .

17. () R1 = 80 (. 2.42). R2 = 100 . U = 50 . , , , D? , .

18. D (. 2.43), ( ) ?

19. R0 ( ), R . .

20. R0 (. 2.44). R.

21. R0 , 2.45, . .

22. , 2.46? R1, R2 R3 U .

23. R = 150 I = 10 . l d = 0,1 , U = 10 ? ρ = 4,2 10-7 .

24. R = 10 , U = 120 U1 = 50 . , U2 = 10 . ?

25. R . 5 , , ? . R0.

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