If the 30mH inductor and the 0.05?F capacitor were used to produce a sine wave from the square wave output. What harmonics of the square wave would be produced across the inductor?
Without knowing the square wave frequency and how the inductor and capacitor are connected (series or parallel), this question can't be answered. Assuming the sine wave output is taken across the capacitor and that the inductor and capacitor are in series, all odd harmonic of the square waves fundamental frequency will appear across the inductor.
