Question

As per the given graph, choose the correct representation for curve A and curve B.

(Where \( X_L = \) reactance of pure inductive circuit connected with A.C. source, \( X_C = \) reactance of pure capacitive circuit connected with A.C. source, \( R = \) impedance of pure resistive circuit connected with A.C. source, and \( Z = \) impedance of the LCR series circuit)

• A. \( A = X_L, B = R \)
• B. \( A = X_L, B = X_C \)
• C. \( A = X_C, B = R \)
• D. \( A = X_C, B = X_L \)

Hint:

Impedance of an inductive circuit increases with frequency, whereas the impedance of a capacitive circuit decreases with frequency.

Answer 1

The Correct Option is D

The given graph shows the variation of impedance with frequency.
- At low frequencies, the impedance of a capacitor \( X_C \) is low, and the impedance of an inductor \( X_L \) is high.
- At high frequencies, the impedance of an inductor increases while that of a capacitor decreases.
Thus, \( A \) represents the capacitive reactance \( X_C \), and \( B \) represents the inductive reactance \( X_L \).