ile™tri™ité et m—gnétisme E „h n¦I voi de goulom˜

a0a0'
0,53 ×10−10m)G'6.67 ×10−11SI,[Nkg−2m2]mp'1,672 ×10−27kg me'0,91 ×10−30kg
1
4π0'9×109SI qe= 1,6×10−19C
q1q2Oy R(Oxy)q1
A(x= 0, y = 0.30m)q2B(x= 0, y =−0.30
Q M(x= 0.40 y= 0
q1q2Q
R(Oxy)
θ Ox
q1=q2= 2µ Q = 4µ
q L
−3q
m= 30 q
l= 15 θ◦
∆V= 100V d= 1cm
L= 2cm v0= 107m s−1
y
vod
L
E= DV/d
v
x
Dy
e
D
y
∆y, vy
D= 0,5 m

Ox
q1=−2.5A(x=−10 q2= +2.5B(x= +10
x= 20cm, y = 0
x= 0, y = 10
Oy
q y =a−2q q y =−a
Ox
x >> a
o
−→
E
Ff=−6πηrv η = 1,8.10−5Pa.s
vl
−→
E
v0
ρh= 1,05.103−3E=
−→
E
= 482 kV.m−1
r= 1,8×10−6
(O, x, y, z)b xb yb z−→ ex
−→
ey−→ ez(O, r, φ, z)b ρb φb z
−→
eρ−→ eφ−→ ez
x y ρ φ
b
ρb φ(b x,b y)
dV
(O, r, θ, φ)
b
rb θb φ
O(Oz)
R O θ0

ρ0
σ0
σ(θ) = σ0cos(θ)
θ

◦
−→
E
ρ
−→
E
λ
−→
EM ρ
V(ρ M
Ox µ
Ox y = +0.4
µ y = +0.2y= 0.6
R= 2 λ
R ρ
−→
E(−→ r)
R V (r)
||−→ E(−→ r)|| V(r)
σ
(P)
σ
−→
Eh
(P)
σ 0
Ez(z)

h
σ−σ
V h
V1V2
−→
E−→ E=−−−−→ grad(V)
−→
E
m= 1.5q= 8.9×µ
+σ−σ d = 5
θ= 30◦
b−λ
a<b +λ
V(r)V= 0 r=b
Vab
Vab