An air-filled parallel plate capacitor is used in a simple series RLC circuit along with a 0.650-H inductor. At a frequency of 220 Hz, the power output is found to be less than the maximum possible power output. After the space between the plates is filled with a dielectric with k = 5.50, the circuit dissipates the maximum possible power.
(a) What is the capacitance of the air-filled capacitor?
(b) What was the resonant frequency of this circuit before inserting the dielectric?