I'm planning on using formula stated below to solve this. Formula: which becomes i(time constant) = (i0 - if) e^(-t/timeconstant) + if Ok so the first step is to calculate the time constant time constant= L/Rth To calculate Rth I'm going to short circuit the independent sources, in another thread Ghar proved that R would be 2x (R1||R2). He proved it quite eloquently but if some one has a short way to prove it please post it. From now on I'm going to use τ as time constant. τ= 4.8x 10^-3 / 5.83 = 8.23x 10^-4 Next I need to calculate I0 So I calculated Req for the whole circuit and Got Isrc = 3.39 I used current divider to get the current that goes in the H like circuit on the right. I1=2.06. I0 is going to be the difference between the current that goes through R1 and the current that goes through R2. I'm not sure how to use current divider here. Any one can help ? Also can't see how calculating I final would be different. If i replace the inductor by a short circuit that doesn't effect the Req so I'll get the same answer.