(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://img14.imageshack.us/img14/4822/2116b.png [Broken]

The circuit has been connected as shown in the figure for a “long” time.

What is the magnitude of the electric potential across the capacitor?

Answer in units of V.

2. Relevant equations

Kirchoff's rules

[tex]V = IR[/tex]

[tex]V(t) = V_{0} e^{-t/\tau}[/tex]

[tex]C = \frac{Q}{C}[/tex]

[tex]Q(t) = Q_{f}(1-e^{-t/\tau)[/tex]

3. The attempt at a solution

http://img215.imageshack.us/img215/7758/2116.png [Broken]

That's how I redrew the circuit. But then I got confused. Does the capacitor short circuit the rest of the circuit (i.e., does no current flow in the 15 ohm and 48 ohm resistors)?

If not, I don't get what happens to (I - i_{1}) and i_{1}once they get to the junction with the capacitor.

Help please?

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# Homework Help: Potential across a capacitor in an RC circuit

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