8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 1/30

A

Electric Potent

Chap

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 2/30

B 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 3/30

+

+ 

+ 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 4/30

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 5/30

4.00 m

 C y 

2.00 C

P 

3.00 m

µ 

µ 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 6/30

E

q 

+

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 7/30

a a 

 y 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 8/30

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 9/30

dq 

a 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 10/30

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 11/30

(a) +

++ +

+ ++

+

R 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 12/30B

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 13/30

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 14/30

+Q 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 15/30

+Q 

Q 

(a)

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 16/30

b 

a 

a 

Q 

b 

r 

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 17/30

Capacitor

symbol

C1

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 18/30

C 2

C 1

Q 2

C 2

Q 1

C 1

∆V  1 = ∆V  2 = ∆V  

C

C2C1

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 19/30

(a)

+ –

C 2

∆V  

C 1∆V  1 ∆V  2

+Q –Q +Q –Q  

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 20/30

a 

F I GURE 5.25 (Example 5.8) To find the

equivalent combination of the capacitors in (a),

the various combinations are reduced in steps as

indicated in (b), (c), and (d), using the series and

parallel rules described in the text. Allcapacitance values are in microfarads.

C

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 21/30

Q 1i +

b a 

C 1

S1 S2

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 22/30

C 0 Q 0

+–

+

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 23/30

)b(

–  + 

–  +

  –  +

–   

+     

     –    +

     –     +      –

       +

  –+

      –      +

     –     +

– +  –

      +

– + 

– +

 –+

–  +

–  + –+

 – + –  +

(a)

+

+

+

+

+

+

F IGURE 5.28 (a) Polar molecules are randomly orie

external electric field is applied, the molecules partially

modeled as an additional pair of parallel plates establish

Q

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 24/30

+

Q 0C 0

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 25/30

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 26/30

k m

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 27/30

20.0 nC

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 28/30

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 29/30

∆V  

Stud

8/9/2019 electrical potential and capacitors

http://slidepdf.com/reader/full/electrical-potential-and-capacitors 30/30

Capacitorplates

Stud finder

 Wallboard

Stud

(a)