*Question G5C14:
Which of the following components should be added to an inductor to increase the inductance?*  

*Correct Answer is  D: An inductor in series*  

### AI Response: (may contain errors)  

To increase the inductance of an inductor, you should add another inductor in series. 

### Correct Answer: D: An inductor in series

- **Explanation**: When you connect inductors in series, the total inductance ($L_{total}$) is the sum of the individual inductances. The formula is:
  
  $$L_{total} = L_1 + L_2 + ... + L_n$$

  This means that adding more inductors in series increases the overall inductance.

### Why the Other Choices are Incorrect:

- **A: A capacitor in series**: 
  - Adding a capacitor in series with an inductor creates a resonant circuit, which can actually decrease the overall inductance at certain frequencies. The effective inductance in this case is not simply additive and can lead to resonance effects.

- **B: A capacitor in parallel**: 
  - A capacitor in parallel with an inductor also forms a resonant circuit. This configuration does not increase inductance; instead, it can lower the overall impedance at resonance, which is not the goal when trying to increase inductance.

- **C: An inductor in parallel**: 
  - When inductors are connected in parallel, the total inductance is given by the formula:
  
  $$\frac{1}{L_{total}} = \frac{1}{L_1} + \frac{1}{L_2} + ... + \frac{1}{L_n}$$

  This results in a total inductance that is less than the smallest individual inductor, which does not help in increasing inductance.

### Summary:
- To increase inductance, use inductors in series.
- Capacitors in series or parallel do not increase inductance and can create resonant effects that complicate the circuit.