WBJEE 2024 Physics & Chemistry Paper

We know, impedance of a series LCR circuit is given by,
⇒Z=√R2+(2πfL−‌

1

2πC

)2
So, 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.