Exercice 1 : Champ magnétique crée par un segment Exercice 2

I
M a θ1θ2
M M
I
x
N M MN =r << x
N
R
θ1θ2M
R << L
z= 0 ~ Js=Js~ux
z= 0

~
J
Oz R1
R2R1< R2I−I
R1R2
r

N
ldy
dB =µ0IR2
2(y2+R2)3/2.N ldy
y
R=−cotangβ dy =R sin2βdβ
dB =µ0IR2
2R3(1 + cotang2β)3/2.N l
R
sin2βdβ
dB =µ0IN
2l.d(−cosβ)
α1α2
B=µ0IN
2l.(cosα2−cosα1)
α1≈0α2≈π
B=µ0IN
l
~
B|| ~ B|| =B(z)

~
B=B(z)~uy
~
B(−z) = −~ B(z)
~uz~uy
B=µ0J
2
|| ~ B|| =B(r)
~
B=B(r)~uθ
~
J=I
πR2~uz
~
B=µ0JR2
2r~ur