.
.
. , ,, .
ϒñ10^5 \,ϒá10^-7 \.
. . , 10 *. - ., ( ) . ( ) . , 2- . (ρ) - .
L, R=L,R=2. AxMyN.
.
R : U=Iρ\4πr, I- . M N :
1) ΔU=MN=UM-UN= U=Iρ\4π(1\AM-1\AN)= U=Iρ\4π(AN\AM-AM\AN)= U=Iρ\4π(MN\AM*AN).
2) UM= U=Iρ\4πAM UN= U=Iρ\4πAN
3) ρ=4π*(AM*AN\MN)* ΔUMN\I=K* ΔUMN\I
. , -.
.
1.- .
MN ∞. ρ=4π*(AM*AN\MN)* ΔUMN\I
N ∞ AN=MN. ρ=4πl*UM\I- .Ρ M.
2. -.
MN 0. ρ=4π*(AM*AN\MN)* ΔUMN\I
ρ=4πL^2\I* ΔUMN\MN=4πL^2\I*grad U* ΔUMN\MN|MN 0=grad U.
ρ .
.
ρ .
.
ΔU. , .
1) =ρ1 : =ρ1, * I.
2) =ρ2 : =ρ2, I. : U1= ρ1\4π*(I\R1+ I\R); U2= ρ2\4π* IR^2.
|
|
(I I) :
1. U1=U2.
2. jn1=jn2. :
ρ1(I + I)=ρ2 I I - I= I. : I=I*(ρ2-ρ1)\(ρ2+ρ1)=K12I I= I*(2-ρ1)\ ρ2+ρ1*(1-K12)I, 12- , .(1-12)- , .