1. The problem statement, all variables and given/known data In the following transient circuit, assume at t<0, the circuit is at steady state. Find i0(t) for t>0 http://sphotos-b.xx.fbcdn.net/hphotos-ash3/c0.0.241.241/p403x403/521743_510378412315012_79982992_n.jpg [Broken] 2. Relevant equations 3. The attempt at a solution First let's try to find Vc(t) capacitor acts as an open. the current of the whole circuit Is = 12V / [(4+2) || 10] = 6.4 mA current going through the 2KΩ = 6.4 mA x (10/16) = 4mA Vc(0+) = V2K = 4mA x 2k = 8V ok, right here I am not sure if Vc(∞) = 0 V to find time constant, we need the Thevenin resistance RTh = 4 || (2+10) =3k T = 200μF x 3K = 3/5 so we got our vc(t) = 8e-5t/3 This is where I got stuck, I really dont know how to relate io(t) with Vc(t) Please help. Thank you very much!