Question
How does an inductor react to AC?
Answer Options
- A) As the frequency of the applied AC increases, the reactance decreases
- B) As the amplitude of the applied AC increases, the reactance increases
- C) As the amplitude of the applied AC increases, the reactance decreases
- D) As the frequency of the applied AC increases, the reactance increases
Correct Answer: D
Explanation
An inductor’s opposition to AC current (inductive reactance, X_L) is directly proportional to the frequency of the applied current. The formula for inductive reactance is X_L = 2\pi f L, where f is the frequency and L is the inductance.
This formula clearly shows that as the frequency of the applied AC increases, the reactance increases. At a very high frequency, an inductor acts almost like an open circuit (very high impedance), a property that makes inductors useful in RF filters and chokes.
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