The two graphs between reactance and frequency for alternating current circuits are given below.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Figure (ii) represents variation of capacitive reactance with frequency.
Compare the frequency dependence of the two reactances.
\( \displaystyle X_L = 2\pi f L \)
\( \displaystyle X_C = \frac{1}{2\pi f C} \)
\( X_L \) is proportional to f, which gives the straight line through the origin in figure (i). \( X_C \) is inversely proportional to f, which gives the falling curve in figure (ii).
NCERT (2026-27):
Ac Voltage Applied to an Inductor – “… The inductive reactance is directly proportional to the inductance and to the frequency of the current.”
Ac Voltage Applied to a Capacitor – “… The capacitive reactance limits the amplitude of the current in a purely capacitive circuit in the same way as the resistance limits the current in a purely resistive circuit. But it is inversely proportional to the frequency and the capacitance.”