321. R 2R σ1 = σ σ2 = -σ, σ = 0,1 /2. : 1) (r) : , ; 2) , r = 3R 
.
322. σ1 = 2σ σ2 = σ, σ= 20 /. : 1) : , ; 2) .
323. σ1 = σ, σ2 = -2σ, σ = 20 /2. : 1) : , , 2) .
324. R . 2R σ1 = 4σ σ2 = σ, σ = 30 /2. : 1) (r) : , ; 2) , r = 1,5 R .
325. R 2R σ1 = -2σ σ2 = σ, σ = 50 /2. : 1) (r) : , ; 2) , r = 1,5 R .
326. R 2R σ1 = -4σ σ2 = σ, σ = 50 /2. : 1) (r) : , ; 2) , r = 1,5 R .
327. R 2R σ1 = σ σ2 = -σ, σ = 60 /2. : 1) (r) : , ; 2) , r = 3R, .
328. R 2R σ1 = -σ σ2 = 4σ, σ = 30 /2. : 1) (r) : , ; 2) , r = 4R, .
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329. R 2R σ1 = -2σ σ2 = σ, σ = 0,1 /2. : 1) : , ; 2) , r = 3R, .
330. , φ1 = 10 , . φ ?
331. = 200 / v0 = 2 /. l, , .
332. (τ = 10 /). W2 , 3 W1 = 200 .
333. m = 40 , q = 1 , v = 10 /. r q0 = 1,33 ?
334. m = 1 q = 10 1, φ1 = 600 , 2, φ2 = 0. 1, 2 v2 = 20 /.
335. , U, 100 .
336. . φ1 = 100 v1 = 6 /. φ 2 , .
337. Cu ++ +, .
338. W = 400 ( ) R = 10 . , , q = -10 .
339. , φ 300 . q = 0,2 , R, , 3R.
340. 1 = 0,6 U1 = 300 C2 = 0,4 , U2 = 160 . , .
341. 1 = 0,2 U1 = 320 . , , U2 = 450 , 400 . 2 .
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342. (ε = 7). U = 100 . , ?
343. , U 1 = 500 , , (). ε, U 2 = 70
344. 1 = 5 2 = 8 ... ε = 80 . q 1 q 2 U 1 U 2 .
345. . U = 1 . , 3 .
346. ( 1 = 1 , 2 = 2 , 3 = 3 ) (U = 220 ). .
347. = 100 . , , .
348. : d 1 = 0,2 d 2 = 0,3 . U = 300 . .
349. , 5 8 , 120 50 , . , .
350. S = 300 2 U = 103 . d = 4 . (ε = 7). , ? .
351. W 1 = 210-7 . ε = 2, .
352. W 1 = 410-7 . ε = 4, .
353. .. 2 . , ε = 2. . d = 1 , S = 50 2.
354. .. 2 . , ε = 2. . d = 1 , S = 50 2.
355. 100 . 200 2, 0,5 , (ε = 2). .
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356. . 210-5 . , . , , , 710-5 . .
357. 100 2 , 1 100 . 25 . , : 1) ; 2) .
358. 0,1 U = 30 . , τ = 1,510-6 . 0,5 .
359. S = 400 2 , ... 200 . d 1 = 2 d 2 = 4 . .
360. ... 12 , 5 . , ?
361. ... ε = 80 , r1 = 5 . = 100 . I , U, , R.
362. t1 = 14 º R 1 = 10 . R 2 = 12,2 . t 2 ? α = 4,1510-3 -1.
363. U = 100 R 1 = 2 , . U = 80 . , U 2 = 60 . R 2 .
364. ... ε = 24 , r = 2,4 . max, .
365. R 1 = 8 I1 = 0,8 , R2 = 15 I 2 = 0,5 . I ...
366. , ... ε = 1,1 r = 1 , R = 9 . I , U Ur . ... η ?
367. ... ε = 1,2 0,2 R. R, ?
368. R = 720 , 300 . , 300 ?
369. R = 680 . () , 2,5 ? 300 .
370. 20 6 6 . ?
371. 10 3, 5 2,3 . ρ = 26 ×.
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372. I 0 = 0 I = 5 10 . , .
373. Q, t = 10 R = 10 , , , I 1 = 10 I 2 = 0.
374. t = 8 R = 8 Q = 500 . q, , .
375. t = 10 Q = 40 . <I> , R = 26 .
376. 10 /2. , ρ = 17 ×.
377. t = 10 I1 = 1 I2 = 2 Q = 5 . R .
378. R = 10 t = 50 I1 = 5 I2 = 10 . Q, .
379. t = 20 , , R = 5 Q = 4 . .
380. . ε 1 = 2 , ε 2 = 4 , R1 =0,5 R2 ( R 2 ) 1 . . .
381. . ε 1 = 30 , ε 2 = 5 , R 2 = 10 , R 3 = 20 . 1 , R3 R1. R 1. .
382. . ε1 = ε2 = 100 , R1 = 20 , R2 = 10 , R3 = 40 , R4 = 30 . . .
383. . ε1 =ε2, R2 = 2 R1. , , , R2? .
384. . ε1 = ε2 = 110 , R1 = 200 , 1000 . . . R2 = 100 .
385. ., ε1 = 2 , ε2 = 1 , R1 = 103 O, R2 = 500 , R3 = 200 R = 200 ? .
386. ... ε1 = ε2 = 2 r1 = 1 r2 = 2 R (. .). ... ε1 I1 = 1 . R I2, ... ε2. I R?
387. , , , 0,5 , ... ε1 = 12 , ε2-= 10 r1 = r2 = 1 . , .
388. . ε1 = 2,1 , ε2 = 1,9 , R1 = 10 , R2 = 10 R3 = 45 . . .
389. . ε1 = 2 , ε2= 4 , ε3 = 6 , R1 = 4 , R2 = 6 R3 = 8 . . .
4.
1. 
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m - ; m 0 - . m = 1,
.
2. --
- , 
c I; 
- -, , ; a - - .
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, , ( ). ( .) . .
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4.
R - .
h - , .
, ( 1):
, :
r 0 - , .
B = mm0 nI,
n - N l.
5. , ( ):
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:
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6.
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- () ; I - , ; S - .
7. , , :
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8.
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N .
10. dA=I d =I×D.
11. ( -): 
.
