*Question G5A05:
How does an inductor react to AC?*  

*Correct Answer is  D: As the frequency of the applied AC increases, the reactance increases*  

### AI Response: (may contain errors)  

An inductor reacts to alternating current (AC) in a specific way that is determined by its reactance, which is influenced by the frequency of the AC signal.

### Correct Answer: D
**As the frequency of the applied AC increases, the reactance increases.**

- The reactance ($X_L$) of an inductor is given by the formula:
  
  $$X_L = 2 \pi f L$$

  where:
  - $X_L$ = inductive reactance in ohms
  - $f$ = frequency in hertz
  - $L$ = inductance in henries

- As the frequency ($f$) increases, the reactance ($X_L$) also increases. This means that inductors oppose the flow of AC more as the frequency rises.

### Why the Other Choices are Incorrect:
- **Choice A: As the frequency of the applied AC increases, the reactance decreases.**
  - This is incorrect because, as shown in the formula, an increase in frequency leads to an increase in reactance, not a decrease.

- **Choice B: As the amplitude of the applied AC increases, the reactance increases.**
  - This is incorrect because the reactance of an inductor is independent of the amplitude (voltage or current) of the AC signal. Reactance only depends on frequency and inductance.

- **Choice C: As the amplitude of the applied AC increases, the reactance decreases.**
  - This is also incorrect for the same reason as Choice B. The reactance does not change with amplitude; it is solely a function of frequency and inductance.

### Summary:
- Inductive reactance increases with frequency.
- The amplitude of the AC does not affect the reactance of the inductor. 

Understanding these principles is crucial for the Extra Class exam and for practical applications in amateur radio.