Conductors,%20dielectrics%20and%20capacitance

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Conductors,%20dielectrics%20and%20capacitance

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Title: Conductors, dielectrics and capacitance Author: Jirasak Last modified by: Kane Created Date: 7/6/2004 5:17:15 PM Document presentation format – PowerPoint PPT presentation

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Title: Conductors,%20dielectrics%20and%20capacitance

1
Conductors, dielectrics and capacitance

????????????
??????????????????? (?????)
?????????????????????????
??????????????????????? ??????????????????????
??????????????
???????????? ???????????? C ???

2
5.1 Current and Current Density

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??????????

????????????????????????????????
??????????????????????????????????????????????????
??? ( ????????????????????????????????????????????
?????? )
???????????????? (current density) ???
????????????????????????????? ?????????????? ???
???????????????????????????????????? ( A/m2 )
3
????
??????? ??????????????????
4
5.2 Continuity of Current
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??????????????????????????????????????????
??????????????? ( ??????????????????????? )

5
5.3 Metallic Conductors

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??????????????????????????????????????????????????
??????

?????? ???????????????????? ( valence
electron) ????????????????????????????????
??????????????????????????????????????????????????
???????????????????? ?????????????????????????????
? ?????????????????
6
??????? ??????????????????????????? ??????
??????? ????? ( conductor )
???????????????????????
7
?????????????????????????????????????????????????
(drift velocity)
8
??????????????????????????????????????
?????? ??? ????????????? ( uniform field)
9
????????????????????????????????????????????/
???? ???????????? (no uniform)
10
5.4 Conductor properties and Boundary conditions
??????????????????????? ??????????????????????????
???? ??????????????????????????????????????
???????????????????????????????????????
??????????????????????????????????
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?????????????????????????????? ??????????????
?????????????? ?????????????????
11
????????????????????
???????????????????????????????????
12
????????????????????????? ????????? ??? Electric
flux density ???????????????? ????????????
???????????????????????
???????????????????????????????? ???????
??????????? equipotential surface

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