1. The problem statement, all variables and given/known data It is in the attachment. NOTE: I supposed I did a little mistake when I drew the circuit with PSpice. The closed switch should look like .---->. instead of having that 45 angle. I don't know if it matters or not, so yea.. 2. Relevant equations Rp = (R1 * R2)/ (R1 + R2) Rs = R1 + R2 + R3 + ... + Rn α(series) = Req / (2*L) Wo = 1/sqrt(LC) 3. The attempt at a solution Okay, well, I'm trying to solve this second order transient circuit, but I have a problem! I can't find the correct equivalent resistance. What I do first is to remove the voltage source by a short and the current source by an open circuit. Now, I gotta find the equivalent resistance to calculate α. What I do is; R12 = (2 * 6) / (2 + 6) = 1.5 ohms then; Req = R12 + R3 + R4 = 1.5 + 4 + 2 = 7.5 ohms According to the book, the Req should be 2 ohms! So either, I'm doing something really wrong, or there's a mistake with the book. Can someone please help me? Any help would be greatly appreciated.