1. The problem statement, all variables and given/known data I'm supposed to find whether the current in the following network is a) under-damped b) critically damped c) undamped c) over-damped 2. Relevant equations According to Kirchoff's laws 3. The attempt at a solution The answer given by my professor for this question is supposed to be "b) critically damped" so I just converted the given values into SI values R = 1kilo-ohm = 1000 ohm L = 10mH = 0,01H C = 40nF = 4 * 10^(-8) and then I tried relating them to But I do not find two real roots that are equal for it to be critically damped. What did I do wrong?