: , , ( ); , , .
21. , ( ). .
( , ). ( , ). .
22. , , . .
I I
D
, , . . : - , , , D - .
, , :
. (3.3.1)
(3.3.1) , i , x y ( ) x, y z ( ). , :
) , (3.3.2)
I R (m0 , m0 = 4p×107 /).
) , (3.3.3)
I R .
) , (3.3.4)
I, R.
) (3.3.5)
I R a ( a !).
, , , = 0.
|
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23. , , . , I = 1 , R = 1 .
|
: I = 1 ,
R = 1 .
: .
. . , , 1 3 , (, 3, ). 1 = 3 = 0. . a = p (a = 180, (3.3.5) ).
( (3.3.1) (3.3.5)):
, .
(3.3.1) :
= 1 + 2 + 3 = 2 = = 3,14×107 .
2 , .
: 3,14×107 .
24. I = 1 , , . , R = 1 .
|
: I = 1 ,
R = 1 .
: .
. . 3 , ). 3 = 0. 1 2. 1 , 2 a = p ( (3.3.5) ).
( (3.3.1), (3.3.3) (3.3.5) ):
, .
, , , x. . 1 , , - :
( 1 )
2 ( 2) . x - ( ). , 1 x, 2 , x.
(3.3.1) : = 1 2,( 3 = 0),
, ,
= 1 2 = = 1×107 3,14×107 = 2,14×107 .
: 2,14×107 .
25. I 1 I 2 R . , . I 1 = 2 , I 2 = 1 , R = 1 .
: I 1 = 2 ,
I 2 = 1 ,
R = 1 .
: .
|
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x
|
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. 23 24, ( (3.3.1) (3.3.4) ):
, .
(3.3.1), , 1 2. , ( ), , ( x z). 1 2: 1 z, 2 x:
2
1
, :
. (3.3.6)
:
(3.3.7)
( ) I 1,
(3.3.8)
( ) I 2.
(3.3.7) (3.3.8), (3.3.6), :
= 1,4×106 .
: 1,4×106 .
, . : , , 90 .
:
FA = IBlsina, (3.3.9)
FA , I , l , B , a .
, , . ( ): , , 90 . , : , , 90 .
:
F = qVBsina, (3.3.10)
F , q , V , , B , a .
, 90 , . :
F = ma = mV 2/ R = qVB, (3.3.11)
m , a () , V , R , .
R V:
= 2 p R / V. (3.3.12)
26. , 1 , 1 . = 0,1 , , 2 . .
: FA = 1 ,
I = 4 ,
B = 1 ,
l = 1 .
: a.
. ( (3.3.9)):
FA = IBlsina,
sina, a:
sina = FA /(Il), Þ a = arcsin [ FA /(Il)] = arcsin (0,25) = 14,5.
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: 14,5.
27. 1
1020 . 1000 /. , 0,002 . , , .
: q = 1 = 1×109 ,
V = 1000 /,
F = 0,002 ,
m = 1020 .
: R, T.
. (3.3.10), (3.3.11), (3.3.12):
F = qVBsina (a = 90 )
F = ma = mV 2 /R = qVB,
= 2 p R V.
(3.3.11):
R = mV/qB. (3.3.13)
(3.3.13) (3.3.12) :
= 2 p R / V = (2 p mV)/(VqB) = (2 p m)/(qB). (3.3.14)
(3.3.10):
= F / qV. (3.3.15)
(3.3.15) (3.3.13) (3.3.14) :
R = mV / qB = (mVqV)/(qF) = mV 2/ F = 5×1012 .
= (2 p m)/(qB) = (2p mV)/ F = 3,14×1014 .
: 5×1012 ; 3,14×1014 .