A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance is

A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of

1.	A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance is
A.	230 Ω
B.	170 Ω
C.	200 Ω
D.	Cannot be determined
Answer» D. Cannot be determined