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

Three capacitors connected to a battery

  • Thread starter Vedj
  • Start date
  • #1
2
0

Homework Statement



6611bd826734c6d4eca8948e9d698d3f6a8.jpg


Examine the figure shown. Note that C3 = 10.5 uF, and C1 = C2 = 2C3. Also the battery voltage is Vb = 39.0 volts.


Homework Equations



What is the equivalent capacitance for this arrangement?
How much charge is stored on C1?

The Attempt at a Solution



C2 and C3 are in parallel, so I used C'=C2+C3
C' is in series with C1, so the total capacitance, C'' is:

((C1)(C'))/(C1+C')

which is equal to:

((C1)(C2+C3))/(C1+C2+C3)

pluging in values, I get an answer of 12.6 uF. I am using an online homework program and am told that this is incorrect. What am I doing wrong?

For the second question, shouldn't I multiply my answer for the first part by the volts value given?

Thank you for you help.
 

Answers and Replies

  • #2
191
0
(c2+c3/2)+c1=C

c2 and c3 are in series, add up the values and divide by the number of caps then add that number to c1 and you have the total capacitance. second question, no, voltage has nothing to do with it.
 

Related Threads on Three capacitors connected to a battery

Replies
2
Views
1K
Replies
4
Views
2K
Replies
3
Views
1K
Replies
7
Views
2K
Replies
4
Views
1K
Replies
8
Views
5K
Replies
7
Views
3K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
3
Views
4K
Top