Question

Which of the following plots may represent the reactance of a series $LC$ combination?

• A. (a)
• B. (b)
• C. (c)
• D. (d)

Answer 1

The correct option is D (d)

Reactance of capacitor, $X_C=\frac{1}{j\omega C}=\frac{-j}{\omega C}$

Reactance of inductor, $X_L=\omega L$

Since in series combination, net reactance$=X_C+X_L=j(\omega L-\frac{1}{\omega C})$

So reactance magnitude tends to infinity as frequency tends to 0 as well as infinity