tu truong dung 2013 mk
TRANSCRIPT
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L thuyt trng in t
Ttrng dng
Nguyn Cng Phng
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Ttrng dng - sites.google.com/site/ncpdhbkhn 2
Ni dungI. Gii thiu
II. Gii tch vct
III. Lut Coulomb & cng in trng
IV. Dch chuyn in, lut Gauss & iveV. Nng lng & in th
VI. Dng in & vt dn
VII. in mi & in dungVIII.Cc phng trnh Poisson & LaplaceIX. Ttrng dngX. Lc t& in cm
XI. Tr ng bin thin & hphng trnh MaxwellXII. Sng phng
XIII.Phn x& tn xsng phngXIV.Dn sng & bc x
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Ttrng dng - sites.google.com/site/ncpdhbkhn 3
Ttrng dng (1)
1. Lut Biot Savart
2. Lut dng in ton phn tnh
3. Rta
4. nh l Stokes
5. Tthng & cng tcm
6. Tth
7. Chng minh cc lut ca ttrng dng
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Ttrng dng - sites.google.com/site/ncpdhbkhn 4
Ttrng dng (2)
Ttrng dng (tnh) sinh ra t:
Nam chm vnh cuin trng bin thin tuyn tnh theo thi gian
Dng in mt chiu
Chxt vi phn dng mt chiu trong chn khng
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Ttrng dng - sites.google.com/site/ncpdhbkhn 5
Lut Biot Savart (1)
2 34 4
RId Idd R R
L a L RH
1 1 122 2
124
I dd
R
L aH
dL1R12
aR12I1
P
2 24 4
L a L aH H R
Id Idd
R R
H: cng ttrng (A/m)
Hng ca H tun theo quy tc vn nt chai
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Ttrng dng - sites.google.com/site/ncpdhbkhn 6
Lut Biot Savart (2)
K
b
I
I Kb
I KdN
Id dSL K
2 24 4
R R
S
d dS
R R L a K aH
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Ttrng dng - sites.google.com/site/ncpdhbkhn 7
Lut Biot Savart (3)
12 ' zz R a a
1 122 2
124
Idd
R
L aH
122 2
'
'
zR
z
z
a aa
2 2 2 3/2
' ( ' )
4 ( ' )
z zIdz zd
z
a a aH
1 ' zd dzL a
2 2 2 3/2
' ( ' )
4 ( ' )
z zIdz z
z
a a aH
; 0z z z a a a a a
2 2 2 3/2'
4 ( ' )dzI
z
aH
2 2 3/2'
4 ( ' )I dz
z
a
2
I
a
'
2 2 2
'
'
4 '
z
z
I z
z
a
1
2
x y
zdL
I
R12
aR
zaz
a
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Ttrng dng - sites.google.com/site/ncpdhbkhn 8
Lut Biot Savart (4)
x y
z
I
1
22 1(sin sin )4
I
H a
x y
zdL
I
R12
aR
zaz
a
2
I
H a
z x
y
z
0
a
a
az
1
2
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Ttrng dng - sites.google.com/site/ncpdhbkhn 9
Lut Biot Savart (5)
2
I
H a
-1-0.5
0
0.5
1
-1
-0.5
0
0.5
1
-6
-4
-2
0
2
4
6
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Ttrng dng - sites.google.com/site/ncpdhbkhn 10
Ttrng dng
Lut Biot Savart
Lut dngin ton phn tnh Rta
nh l Stokes
T thng & cng t cm
T th
Chng minh cc lut ca t trng dng
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Ttrng dng - sites.google.com/site/ncpdhbkhn 11
Lut dng in ton phn tnh (1)
.H Ld II
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Ttrng dng - sites.google.com/site/ncpdhbkhn 12
Lut dng in ton phn tnh (2)
2
I
H a
x y
zdL
I
R12
aR
zaz
a
H aH
2
0.H Ld H d
tg( )L a ad d d
.H Ld I
2
0d
2 I
2
H
V d1
dL
I
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Ttrng dng - sites.google.com/site/ncpdhbkhn 13
II
ab
c
Lut dng in ton phn tnh (3)V d2
1
1
1
1
)(2 b
I
H a
2H
I
:a2
2I I
a
2I H
2
22 H I
a
2( )
2I a
a
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Ttrng dng - sites.google.com/site/ncpdhbkhn 14
II
ab
c
Lut dng in ton phn tnh (4)V d2
)(2
bI
H a
0bao k n dy dn trong dy dn ngoiI I I I I :c
2( )
2I a
a
0 ( )c
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Ttrng dng - sites.google.com/site/ncpdhbkhn 15
II
ab
c
Lut dng in ton phn tnh (5)V d2
)(2
bI
H a
baokn
2
IH
2( )
2I a
a
0 ( )c
2 2
2 2( )
2
I cb c
c b
:b c 2 2 2 2
2 2 2 2bao k n dy dn trong mt phn dy dn ngoib c
I I I I I Ic b c b
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Ttrng dng - sites.google.com/site/ncpdhbkhn 16
II
ab
c
Lut dng in ton phn tnh (6)V d2
2)( ); (
22
bI
H I a H a
a
2 2
2 2( ); 0 ( )
2
I cb c H c
c b
a3a
4a
2I
a
4
I
a
0 2a 4a c3a b
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Ttrng dng - sites.google.com/site/ncpdhbkhn 17
Lut dng in ton phn tnh (7)
x
y
z
K=Kyay
L
2
2
1
1
3
3
1 2 ( )x x yL H L K L
1 2x x y
H K
3 1x xH
3 2x x yH K
1( 0)2
1( 0)
2
x y
x y
H K z
H K z
12
N H K a
z
K=Kyay
K= Kyay
h
0(0 )
0 ( 0, )
N z h
z z h
H K a
H
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Ttrng dng - sites.google.com/site/ncpdhbkhn 18
Ttrng dng
1. Lut Biot Savart
2. Lut dng in ton phn tnh3. Rta (xoy, cun)
4. nh l Stokes
5. Tthng & cng tcm
6. Tth
7. Chng minh cc lut ca ttrng dng
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Rta (1)
1 2 ,1 2( )H. L yH y
,1 2 0
1
2
yy y
HH H x
x
1 2 0 1( )2
H. L yyH
H x yx
z
x y
x
y1 2
34
H = H0 =Hx0ax +Hy0ay +Hz0az
2 3 ,2 3 0
1( ) ( )
2H. L xx x
HH x H y x
y
3 4 0
1( )
2H. L
yy
HH x y
x
4 1 0
1( )
2H. L x
x
HH y x
y
.H Ld I
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Ttrng dng - sites.google.com/site/ncpdhbkhn 20
Rta (2)
1 2 01( )2
H. L yy
HH x yx
2 3 0
1( )
2
H. L xxH
H y x
y
3 4 0
1( )
2H. L
yy
HH x y
x
4 1 0
1( ) 2H. L
xx
HH y xy
.H Ld I
.H L y xH H
d x yx y
1 2 2 3
3 4 4 1
. ( ) ( )
( ) ( )
H L H. L H. L
H. L H. L
d
z
x y
x
y1 2
34
H = H0 =Hx0ax +Hy0ay +Hz0az
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Ttrng dng - sites.google.com/site/ncpdhbkhn 22
Rta (4)
, 0
.lim
y xz
x y
d H H
x y x y
H L
, 0
.lim
H L yzx
y z
d HH
y z y z
, 0
.lim
H Lx z y
z x
d H H
z x z x
0
.
rot limNN S N
d
S
H LH
t
-SN: mt phng cang tch phn kn- (rotH)N: thnh phn ca rotH vung gc viSN
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Ttrng dng - sites.google.com/site/ncpdhbkhn 23
Rta (5)
0
.rot lim
N
NS N
d
S
H LH
rot y yx xz z
x y z
H HH HH H
y z z x x y
H a a a
rot
x y z
x y z
x y zH H H
a a a
H
rot H H
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Ttrng dng - sites.google.com/site/ncpdhbkhn 24
Rta (6)
rot y yx xz zx y zH H
H HH Hy z z x x y
H H a a a
( )1 1 1z z z
H H H HH H
z z
H a a a
( sin ) ( )1 1 1
sin sin
( )1
rr
r
H rHH H
r r r
rH H
r r
H a a
a
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Rta (7)
Ttrng dng - sites.google.com/site/ncpdhbkhn 25
V d
Tm rta ca cc vctsau:
2 2
2
2
)
sin) cos
cos sin
) sin cos
x y z
z
r
a x y y z xy
zb
c r r
A a a a
B a a
C a a
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Ttrng dng - sites.google.com/site/ncpdhbkhn 27
Rta (9)
rot y yx xz z
x y z
H HH HH H
y z z x x y
H H a a a
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Ttrng dng - sites.google.com/site/ncpdhbkhn 28
Rta (10)
rot H= H a a ay yx xz z
x y z
H HH HH H
y z z x x y
, 0
.lim
y xz
x y
d H H
x y x y
H L
, 0
.lim
H Lyz x
y z
d HH
y z y z
, 0
.lim
H Lx z
yz x
d H H
z x z x
H J
(Phng trnh Maxwell 2)
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Ttrng dng - sites.google.com/site/ncpdhbkhn 29
Ttrng dng
1. Lut Biot Savart
2. Lut dng in ton phn tnh3. Rta (xoy, cun)
4. nh l Stokes
5. Tthng & cng tcm
6. Tth
7. Chng minh cc lut ca ttrng dng
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Ttrng dng - sites.google.com/site/ncpdhbkhn 30
S
S
S
S
aNnh l Stokes (1)
IJ NN
S
.H L
J
S
N
d
S
.I H LN Sd ( )J HN N
.( ) ( ).
H LH H a
S
N N
d
S
. ( ). ( ).H L H a H SS Nd S
. ( ).H L H SS
d d
S
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Ttrng dng - sites.google.com/site/ncpdhbkhn 31
nh l Stokes (2)
x
y
z
= 0,25 r = 5
1
2
3
V d1
. ( ).H L H SS
d d
x
y
z
dr
rd
rsind
sinL a a ard dr rd r d
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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Ttrng dng - sites.google.com/site/ncpdhbkhn 32
nh l Stokes (3)V d1
. ( ).H L H SS
d d sinL a a ard dr rd r d
. .( sin )H L H a a ard dr rd r d
1,2,31, 2,3 : 5 0r dr
sinrH dr H rd H r d xy
z
= 0,25 r = 5
1
2
3
1 2 3r r r r H dr H dr H dr H dr
0rH dr
0H
H rd 0H rd
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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Ttrng dng - sites.google.com/site/ncpdhbkhn 33
nh l Stokes (4)V d1
. ( ).H L H SS
d d . sinH L rd H dr H rd H r d
0rH dr
x
y
z
= 0,25 r = 5
1
2
3
1 2 3sin sin sin sinH r d H r d H r d H r d
0H rd
2sin sinH r d H r d
1,31,3 : const 0d
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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Ttrng dng - sites.google.com/site/ncpdhbkhn 34
nh l Stokes (5)V d1
. ( ).H L H SS
d d . sinH L rd H dr H rd H r d
0rH dr
x
y
z
= 0,25 r = 5
1
2
3
2. sinH Ld H r d
0H rd
2sin sinH r d H r d
0,25
0sinH r d
0,25
205sin(0,22 )H d
0,25
203,19H d
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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nh l Stokes (6)V d1
. ( ).H L H SS
d d . sinH L rd H dr H rd H r d
x
y
z
= 0,25 r = 5
1
2
3
218.5.sin(0, 22 )cosH
0,25
20 3,19H d
57,37cos
0,25
0. 3,19.57,37cosH Ld d
0,25
0 182,84cos d
0,250
182,84sin 182,84sin(0,25 ) 129,27 A
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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nh l Stokes (7)V d1
. ( ).H L H SS
d d . 129,27 AH Ld
x
y
z
= 0,25 r = 5
1
2
3
( ).H SS d ( sin )1sin
( ) ( )1 1 1sin
H a
a a
r
r r
H H
r
rH rHH Hr r r r
1 1 1
36 sin cos cos 6 cos 36 sin cossin sin
a arr r rr r
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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Ttrng dng - sites.google.com/site/ncpdhbkhn 37
nh l Stokes (8)V d1
. ( ).H L H SS
d d . 129,27 AH Ld
x
y
z
= 0,25 r = 5
1
2
3
( ).H SS d
1 1 1
36 sin cos cos 6 cos 36 sin cossin sin
a a SrSr r r d
r r
1
36cos cos 6cos 36sin cossin
a a SrSd
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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Ttrng dng - sites.google.com/site/ncpdhbkhn 38
nh l Stokes (9)
x
y
z
= 0,25 r = 5
1
2
3
V d1
( ).H SS
d
x
y
z
dr
rd
rsind
2 sinS ard r d d
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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Ttrng dng - sites.google.com/site/ncpdhbkhn 39
nh l Stokes (10)V d1
. ( ).H L H SS
d d . 129,27 AH Ld
x
y
z
= 0,25 r = 5
1
2
3
( ).H SS
d 1
36cos cos 6cos 36sin cossin
a a SrSd
2 sinS ard r d d
( ). 36cos cosH S a SrS Sd d
2(36cos cos )(5) sinS
d d
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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nh l Stokes (11)V d1
. ( ).H L H SS
d d . 129,27 AH Ld
x
y
z
= 0,25 r = 5
1
2
3
2
( ). (36cos cos )(5) sinH SS Sd d d 0,25 0,22 2
0 0(36cos cos )(5) sin d d
0,220,25
20
0
1900 sin cos2
d
0,25
0 182,84cos d
0,25
0182,84cos d
0,25
0182,84sin 129,27 A
Cho H = 6rsinar+ 18rsincosa A/m.
Kim nghim nh l Stokes.
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Ttrng dng - sites.google.com/site/ncpdhbkhn 41
nh l Stokes (12)
( )H . S J. Sd d
H J
.H Ld I
I
V d2
.H Ld IRt cng thc t H J
( )H . S J. SS S
d d . ( ).H L H S
Sd d
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Ttrng dng - sites.google.com/site/ncpdhbkhn 42
Ttrng dng
1. Lut Biot Savart
2. Lut dng in ton phn tnh3. Rta (xoy, cun)
4. nh l Stokes
5. Tthng & cng tcm
6. Tth
7. Chng minh cc lut ca ttrng dng
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Tthng & cng tcm (1)
nh ngha cng tcm B trong mi trng tdo:
B = 0H n v: Wb/m2 hoc T hoc G (1T = 10000G)
0 = 4.107 H/m
nh ngha tthng (dng t):
Nhc li vthng lng:
.B SS
d
.D SS d Q
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Tthng & cng tcm (2)
Lut Gauss cho ttrng:
Theo nh l ive rt ra c p/trnh Maxwell 4:
Bcc phng trnh Maxwell:
. 0S d B S
0.B
0
0
.D
EH J
.B
v
0
. 0
D. S
E. L
H. L J. S
B S
vS V
S
S
d Q dv
d
d I d
d
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Ttrng dng - sites.google.com/site/ncpdhbkhn 46
Ttrng dng
1. Lut Biot Savart
2. Lut dng in ton phn tnh3. Rta (xoy, cun)
4. nh l Stokes
5. Tthng & cng tcm
6. Tth
7. Chng minh cc lut ca ttrng dng
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Tth(1)
nh ngha tthVm theo cng thc:
V nn:
V rta ca gradient ca mt i lng v hng phibng zero nn:
H mV H J
( )H J mV
( 0)mV H J
0.B 0 0.B .H
0 ( ) 0. mV 2 0 ( 0)JmV
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a b c
Irax
y
Tth(2)P(, /4, 0)
: 0Jba
)(2 b
I
a H a
( 0)H JmV
12
mm
VI V
2
mV
2mV
1 ( 0, 1, 2, ...)8
I n n
12 ( 0, 1, 2, ...)
2 4mP
IV n n
0t 0mV
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Tth(3)
nh ngha vcttthA theo cng thc:
n v: Wb/m
V nn
C thtnh A theo cng thc:
B A
0 0
1 1
H B A 0
1
H J A
0
4
LA
Id
R
dL R
aRI
P
0
4
LA
Idd
R
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Tth(4)
0
2 24A az
Idz
d z
x
y
z
z
IdL =Idzaz
2 2
R z P(, ,z)
0
4
LA
Idd
R
2 2R z
L azd dz
0
2 2 0 04
a
A A A
z
z
Idz
d d dz
0
1H A
0
1H Ad d
0
1az
dA
2 2 3/ 24 ( )H a
Idzd
z
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Tth(5)
Nu c mt dng in J chy trong mt khi no th:
IdL = Jdv
0
4
LA
Idd
R
04
JA V
dv
R
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Ttrng dng - sites.google.com/site/ncpdhbkhn 52
Ttrng dng
1. Lut Biot Savart
2. Lut dng in ton phn tnh3. Rta (xoy, cun)
4. nh l Stokes
5. Tthng & cng tcm
6. Tth
7. Chng minh cc lut ca ttrng dng
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(1)
Dng cc cng thc/nh ngha
chng minh cng thc
0
4
JA
V
dv
R
024
L aH B H B ARId
R
024 4
J L aA H
V
dv Id
R R
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 54
(2)0
24 4
J L aA H
V
dv Id
R R
0 1 12124
JAV
dvR
Gisvi phn dng (x1,y1,z1), A
(x2,y2,z2)
0 1 12 2 22
0 0 124
JAH
V
dv
R
0
0 0
B H B AH
B A
1 12
12
1
4
J
V
dv
R 12 1
12
1
4
J
Vdv
R
( ) ( ) ( )V V VS S S
2 2 1 2 1 112 12
1 1 1
4J J
VH dv
R R
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 55
(3)0
24 4
J L aA H
V
dv Id
R R
Gisvi phn dng (x1,y1,z1), A(x2,y2,z2)
2 2 1 2 1 112 12
1 1 1
4J J
VH dv
R R
2 1 0J
2 2 1 112
1 1
4J
VH dv
R
2 2 212 2 1 2 1 2 1( ) ( ) ( )R x x y y z z 12 122 3 212 12 12
1 R a
R R R
12 12 12
12
1
4
a JH R
Vdv
R
1 12 12
12
1
4
J aRV
dvR
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 56
(4)0
24 4
J L aA H
V
dv Id
R R
Gisvi phn dng (x1,y1,z1), A(x2,y2,z2)
1 1 122 2124
L aH RI dR
1 122 12
12
1
4
J aH R
Vdv
R
1 1 1 1J Ldv I d
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 57
(5)
H J
0B H H J
B A
2 2 2 2x x y y z zA A A A a a a
2
( ) A .A A
0 0
1
BH A
2
0
( )
.A AH
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 58
(6)
H J
0 1 1
2124
V
dv
R
J
A
2
0
( )
.A AH
.( ) ( ) ( )S S S A A. .A
02 2 1 2 2 1 1
12 12
1 1( )
4 Vdv
R R
.A J . .J
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 59
(7)
H J
02 2 1 1 1
12
1
4 Vdv
R
.A J .
121 23
12 1212
1 1
R RR
R
2 1 112
1
( ) 0V dvR
.J
02 2 1 2 2 1 112 12
1 1 ( )4 V
dvR R
.A J . .J
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 60
(8)
H J
02 2 1 1 112
14 V
dvR
.A J .
.( ) ( ) ( )S S S A A. .A
0 12 2 1 1 1 112 12
1( )
4 Vdv
R R
J
.A .J .
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 61
(9)
H J
1
0 12 2 1
12
04 S
dR
J.A S
1 1 0
v
t
.J
S Vd dv J. S .J
0 12 2 1 1 1 112 12
1( )
4 Vdv
R R
J.A .J .
-
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Ttrng dng - sites.google.com/site/ncpdhbkhn 62
(10) H J
0 .A
04
v
V
dvV
R
0
4
xx
V
dvA
R
2
0
( )
.A AH
2
0
2
0
2
0
x x
y y
z z
JJ
J
2
0
vV
H J
2
0 A J