Question

The frequency of AC supply is determined by the:

• A. Inductive reactance
• B. Capacitive reactance
• C. Resistive reactance
• D. Both inductive and capacitive reactance

Hint:

Inductive and capacitive reactances both depend on the frequency of the AC supply and affect the impedance of the circuit.

Answer 1

The Correct Option is D

Step 1: Role of frequency in AC circuits
In an AC circuit, the supply frequency \(f\) is an external parameter that determines the behavior of inductors and capacitors.

Step 2: Dependence of reactance on frequency
Inductive reactance:
\( X_L = 2\pi f L \) Capacitive reactance:
\( X_C = \frac{1}{2\pi f C} \)

Step 3: Physical interpretation
As frequency changes, both reactances change, affecting current and impedance of the circuit.

Final Conclusion:
Thus, inductive and capacitive reactances depend on frequency, not vice versa.