The unknown quantities to be determined are (a) the capacitive reactance, (b) the maximum and the rms voltages from the source, and (c) the rms current in the capacitor.

Evaluate the capacitive or inductive reactance, XC or XL.

The unknown quantity to be determined in part (a) is the circuit's capacitive reactance
XC defined as
XC ≡ 1/2fC
,
where, in this problem, C = 4.48 F and the AC source frequency f must be determined.

What is the frequency f of the AC source?