.
, (. .). . :
1) . .
2) , .. , .
3) , .
4) .
5) . , , , .
, j = const.
. . q. , dA=qE×cosa×dl = q×dj = 0, .. dj = 0. q,E ×dl ¹ 0,
cosa = 0 a = 90 .
. , . , 0. . . | |
, , . . |
1. 6.
.
( ) : , , .. . , ( ) , . , dE dj () , . .
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2. 1.
.
-
(×2/ = ×) | , n , dS , = const; n n | ||
S | |||
-²- -²- -²- S | |||
: , , e (e ) | ||
1) , s (/2)
: 1) () (). : 1) S1 2) S2 , . , .
(¨) | S1 () S2. () E ^ n, a = 0, cosa = 1. | ||
(¨¨) | ; F2 = 0, .. S2 . (¨) (¨¨), E(r). | ||
q = s×2pR2 | , . . |
2. 2.
.
: , , e (e ) | ||
2) , t (/)
l.
, .
. - cosa = 1, - cosa = 0. | |||
; l. , E(r). | |||
2. 3.
.
: , , e (e ) | ||
3) , :
1) t
2) s.
. , . t , . (s×2p×R×l) E , r .
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2. 4.
.
: , , e (e ) | ||
4) , , s.
S , . (2× /2). .
S = 0, .. × E ^ n, a = 90 cosa = 0 | ||||
S , | ||||
S = S , .. . | ||||
5) , , ( ). , :
A) = 2 - 1 = 0 B) = 2 + 1 = s /e C) = 1 - 2 =0 | ||
, . |
3. 1.