# Capicitance and Voltage (HELP!)

1. Feb 11, 2010

### traceurnin

I am really confused on how to solve this Physics question. I attempted the first one but is wrong for some reason.

A 7.0 micro F and a 3.0 micro F capacitor are connected in series and this combination is connected in parallel with a 4.4 micro F capacitor.

a) What is the net capacitance?
b) If 24 V is applied across the whole network, calculate the voltage across each capacitor.

For part a, i tried to do:

1/Net Capacitance = 1/(7+3) + 1/4.4 and got 3.056 for the net capacitance. However, it is saying that i am wrong. Can you tell me what i am doing wrong?

2. Feb 11, 2010

### kuruman

First find the capacitance of the series combination. What is it?

3. Feb 11, 2010

### traceurnin

haha nvm i get part a

for part a i got 1/7 + 1/3 and took the inverse of that then added it to 4.4 XD

how do you do part b?

4. Feb 11, 2010

### kuruman

You have a 1/7 + 1/3 μF capacitor in parallel with a 4.4 μF capacitor. What is the voltage across the 4.4 μF capacitor? What is the voltage across the 1/7 + 1/3 μF combination capacitor?