FisicaIII lista03
Transcript of FisicaIII lista03
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Q
R
b
R =√ 3b
a
−Q
ρ(r)
−βr2
β
b
c
β
E
r
a
R
Q
ρ(r) = αe−2r/R
r2
α
R
α
R r R
r
R
a
b
c
λ
r
r
r
r
c
R
Q
R 2R
ρ
ρ
ρ
r
R
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R
r 2R r 2R
r
R
ρ
r
R
r
R
x
σ1 r1
σ2 r2
L
x
a
b
ρ = A/r
A
r
q
A
R
ρ = ρ0
a −
r
b
,
ρ0, a b r
r < R
r >
+q
a
R
a
b
a < b < R
ρ
E
E
+q
(x, y)
a
a
y
x+q
+q
+q
l
L
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P
x
P
a
b
λ
V (r)
r
a
a
r
b
r
b
V
r
b
V ab = λ
2π0ln(b/a)
E (r) = V abln(b/a)
1
r
ra
rb +q −q
r < ra ra < r < rb
r > rb
ra < r < rb
r
R
σ = Cr
C
r
V (x, y) = x2 − 3xy,
x
y
(x = 1m, y = 2m)
a
P
x
x
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xy
x
y
z