How Do You Calculate Initial Current in a Multi-Capacitor RC Circuit?

[jforce93]

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

 

[jforce93]

Sorry, forgot to attach a picture of the circuit. Will do that soon.

 

[gneill]

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?