• Support PF! Buy your school textbooks, materials and every day products Here!

Capacitance from plates

  • #1
Krushnaraj Pandya
Gold Member
697
71

Homework Statement


Five plates with same area are placed as in figure. Distance between any 2 consecutive plates is d. Find equivalent capacitance(ab). (Note-Answer is given as 5C/3, in terms of C so I suppose C is capacitance of a +ve and -ve plate separated by d). The lower letter is A, it is marked positive and upper letter is B marked negative.


Homework Equations


All related.

The Attempt at a Solution


numbering 1 to 5 from top to bottom. I can see 1 capacitor due to negative 2 and positive 3 and none else since 1 and 4 are uncharged so answer should be C...unless charges get induced. In that case there are 4 capacitors and answer should be 4C. I'd be grateful for some help.
 

Attachments

Answers and Replies

  • #2
129
17
Your picture is not clear. Please post another one.
 
  • #3
Krushnaraj Pandya
Gold Member
697
71
Your picture is not clear. Please post another one.
I only have a inbuilt webcam...please pardon the poor quality. I'll post another one however, I've provided all information and the general outline of the figure should be enough...
 

Attachments

  • #4
CWatters
Science Advisor
Homework Helper
Gold Member
10,529
2,295
Try drawing an equivalent circuit. It should have four capacitors on it, one per gap.

The top plate and forth plate are connected together. I recommend labeling that connection node C.
 
  • #5
Krushnaraj Pandya
Gold Member
697
71
Try drawing an equivalent circuit. It should have four capacitors on it, one per gap.

The top plate and forth plate are connected together. I recommend labeling that connection node C.
Got it! That was very neat. Thank you very much for your help.
 

Related Threads on Capacitance from plates

Replies
2
Views
2K
  • Last Post
Replies
1
Views
4K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
12
Views
3K
  • Last Post
Replies
16
Views
568
  • Last Post
Replies
5
Views
8K
Replies
7
Views
2K
  • Last Post
Replies
4
Views
881
Replies
4
Views
9K
Replies
6
Views
4K
Top