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# 99 學年上學期高二物理

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### 3-1 A New Look at Coulomb’s Law

Using Gauss’s law to take advantage of special

symmetry situations

Gaussian surfaces

• 高斯面上各點電場與面 內總電荷相關

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For a fluid

m/s × m2 = m3/s

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### 3-3 Flux of an Electric Field

For a flat surface

For a arbitrary (asymmetric) surface

A E

EA A

E     

 ( cos ) cos

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0

0  

EA EA

A d E

A d E

A d E

A d E

c b

a

 

 

 

 

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r

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2

r

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2

left face: ˆ

3.0 1.0 3.0 12 /

l

dA dAi

dA dA N m C

 

 

### 

  

2

(3.0 ˆˆˆ 4.0 ) ( )

[(3.0 )( ) ˆˆˆˆ (4.0)( )( )]

(0 4.0 ) 4.0 16 /

t xi j dAj

x dA i j dA j j

dA dA N m C

   

   

    

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Flux 

enclosed charge

enc

##  

0 0

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### 3-5 Gauss’ Law and Coulomb’ Law

From G.L. to C.L.

2 0

2 0

0

0 0

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### 3-6 A Charged Isolated Conductor

• 同號電荷相斥

• 導體內部無電場

The external electric field

enc

0

0 0

,

E A

EA

EA A

q enc

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enc

0 0

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6 0

3 0

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0

0

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1

0 0

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2 0

###  

The Shell Theorems

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2 0

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21 2

0

17

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3 0

2 0

3 3 3

3

###  

(1) principle of legality - everything must be done according to law (2) separation of powers - disputes as to legality of law (made by legislature) and government acts (by

1.8 Teachers should take every opportunity to attend seminars and training courses on special education to get a better understanding of the students’ special needs and

What is the danger if your hair suddenly stands up?... Lightning bolt

• Using Gauss’s law to take advantage of special.. symmetry