1. The problem statement, all variables and given/known data The switch k is turned at t=0. Calculate [tex]i_k(t)[/tex], when t starts from 0. You can find the circuit in my link. 2. Relevant equations All of them, basically. :tongue: 3. The attempt at a solution http://www.filefactory.com/file/af19a7h/n/index_mht You can find my attempt there. It's in .mhtml format, but any basic browser should open it. I'm not quite sure, if my Laplace to time transformation is correct. The factor before sin is so small. I'd appreciate it, if someone could take a look. My symbols might differ from your's. But j is imaginary unit (i.e. 1+j), small letters are in time plane, captiol letters are in complex plane an captiol letters with (s) are in Laplace plane.