1. The problem statement, all variables and given/known data In the circuit shown in the figure below, the hase difference between the current and the voltage is 30 degrees, show how could you verify the capacitance of the conductor so that the phase difference could be 15 degrees. 2. Relevant equations tan θ=-Xc/R (the phase difference in the RC cirucit with an AC source) 3. The attempt at a solution That is my attempt, I show how much would be the value of the capacitance in the second case mathematically. Is it correct?