Referring to the given circuit, what is Z TH if R 1 is changed to 220

1.	Referring to the given circuit, what is Z TH if R 1 is changed to 220 ?
A.	225 12.1Â°
B.	225 77.9Â°
C.	46 77.9Â°
D.	46 12.1Â°
Answer» D. 46 12.1Â°

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