- − , :
J =lim | ∑ pm, | (4.2.1) | ||
V | ||||
V →0 | V |
V − , .
, . - ,
:
(4.2.2)
χ − ,
.
B 0
I
. 4.2.1
, , - S l, 0. B 0 (. 4.2.1). , , -
. , - (. 4.2.1). , , , - Bi (1.6.4) ( - , - ):
Bi =μ0 | I | , | (4.2.3) | |
l |
I − , ; l − .
p = I | S = | I Sl | = | I | V, | (4.2.4) | ||
m | l | l | ||||||
V − .
J :
J = pVm = I l .
(4.2.3) (4.2.5), : B i =μ0 J B i =μ0 J.
(4.2.6) (4.2.1) :
B = B i + B 0=μ0 J + B 0=μ0 J +μ0 H,
(4.2.6)
(4.2.5)
(4.2.6)
(4.2.7)
B =μ0 J +μ0 H =μ0χ H +μ0 H =μ0(1+χ) H =μ0μ H, (4.2.8)
1 + χ = μ − , - . , :
|
|
μ = | B | = | B | . | ||
μ 0 H | ||||||
B 0 | (4.2.9) |
χ -, , μ , .
6
4.3. . - .
4.4. . . .
4.5. , .
4.6. - ( ).