We know, impedance of a series LCR circuit is given by,
⇒Z=√R2+(2πfL−‌)2So, when we go from point
C to point
A, in the curve, frequencies decreases and impedance increases. It means capacitive resistance,
Xc increases. Hence,
Z is capacitive in the portion AC.
But when we go from point C to B , f increases, Z increases. So, inductive resistance,
XL must increase.
Hence,
Z is inductive in portion
BC.
Therefore, options (C) and (D) are correct.