1. The problem statement, all variables and given/known data You have a 0.400H inductor and a 6 micro-Farad capacitor. Suppose you take the inductor and capacitor and make a series circuit with a voltage source that has a voltage amplitude of 30.0V and an angular frequency of 250 rad/s. What is the phase angle (phi) of the source voltage with respect to current? 2. Relevant equations tan(phi) = (V_L - V_C) / V_R = (I(X_L - X_C)) / (IR) = (X_L - X_C) / R 3. The attempt at a solution First, with no resistor, all the above equations diverge. Also, I figured that since in an inductor, v leads i by pi/2, and in a capacitor, v lags i by pi/2, the answer may be zero, but Mastering Physics deemed it wrong. Any help greatly appreciated!