1. The problem statement, all variables and given/known data Since I dont have a pic.. I will explain my problem. I have a circuit with 3 terminals x , y and z. Between x - z I have a resistance , say R, Between z - y I have an inductor L and then a capacitor C in series. I apply a square wave input between x and y. 2. Relevant equations How will the voltage at output look like? and why does it look like it? output terminals being z-y. 3. The attempt at a solution I already know the answer except I cant understand it. Answer being, Vzy would be discontinuous. So far, I have , at the rising edge of the square wave, an impulse current would be across L, now I dont understand how the capacitor will react. can someone explain it? so how would Vzy be discontinuous?