16.360 lecture 14
DESCRIPTION
16.360 Lecture 14. Today. Orthogonal coordinate systems. The Cartesian (rectangular) coordinate system The cylindrical coordinate system The spherical coordinate system. 16.360 Lecture 14. Cartesian coordinate system. z. dl. . . y. x. 16.360 Lecture 14. - PowerPoint PPT PresentationTRANSCRIPT
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16.360 Lecture 14
• Today
Orthogonal coordinate systems
1. The Cartesian (rectangular) coordinate system2. The cylindrical coordinate system3. The spherical coordinate system
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16.360 Lecture 14
• Cartesian coordinate system
x
y
z
dl
xl
yl
zl
^^^^^^zdzydyxdxzdlydlxdlld zyx
dydzxdldlxsd zyx
^^
dxdzydldlysd zxy
^^
dxdyzdldlzsd yxz
^^
dxdydzdv
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16.360 Lecture 14
• Cartesian coordinate system
x
y
z
xs
s directions of area
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16.360 Lecture 14
• Cylindrical coordinate system
z
x
y
),,( 111 zrP
^r
^
^z
^^^zr
^^^rz
^^^rz
0^^rr 1
^^ rr
zr AzAArA^^^
222zr AAAA
1R
1
^
1
^
1 zzrrR
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16.360 Lecture 14
• the differential areas and volume
^ drdzsd
^rdzrdsd r
^zdrrdsd z
z
x
y
dr rd
drdzrddv
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16.360 Lecture 14
Example: cylindrical area
z
x
y
5
3
3060
3/
6/
3
0
60
30
35
ddzrdS
^rdzrdsd r
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16.360 Lecture 14
• Spherical coordinate system^^^ r
^^^R
^^^ R
0^^rr 1
^^ rr
AAARA R
^^^
222 AAAA R
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16.360 Lecture 14
• differential volume in Spherical coordinate system
dRRddRR
dldldlRld R
sin^^^
^^^
ddRRdldlRsd R sin2^^
dRdRdldlsd R sin^^
dRdRdldlsd R
^^
ddRdRdldRdldv sin2
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16.360 Lecture 14
• Examples
(1) Find the area of the strip
60
30
360
0
2 sin ddRSdS R
(2) A sphere of radius 2cm contains a volume charge density 2cos4v
Find the total charge contained in the sphere
100/2
0
260
0
2180
0
2
100/2
0
2260
0
180
0
2
100/2
0
2260
0
180
0
))(sincos4(
))(sincos4(
)sin(
dddRR
dddRR
RdddRdvQ vv
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