Multiple capacitor RC circuit

  • Thread starter jforce93
  • Start date
  • #1
26
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Homework Statement



The circuit used in this problem is attached as an image. I made this in gEDA (the circuit is from the homework problem, I just didn't feel like using a scanner to get the image)
The 2-microfarad capacitor shown in the circuit attached is fully charged by closing switch S1 and keeping switch S2 open, thus connecting the capacitor to the 2,000 Volt power supply. At a later time, switch S1 is opened. Switch S2 is then closed. The 6-micro farad capacitor is initially uncharged. Determine the initial current in teh resistor the instant after switched S2 is closed.

Homework Equations



I = [itex]\frac{-q0}{RC}[/itex] e-t/RC (discharging a capacitor)
V = IR

The Attempt at a Solution



I'm not sure how to go about this, and I don't have an answer key. Should I calculate using the fact that the 2 micro farad capacitor is discharging, or the fact that the 6 microfarad capacitor is charing?
Thanks!

Jordan

Homework Statement





Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution

 

Attachments

  • circuit final.png
    circuit final.png
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Answers and Replies

  • #2
26
0
Sorry, forgot to attach a picture of the circuit. Will do that soon.
 
  • #3
gneill
Mentor
20,925
2,867
To find the initial current through the resistor, find the initial potential across that resistor. What are the initial voltages on the two capacitors at the instant S2 is closed?
 

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