*Question G5C11:
What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?*  

*Correct Answer is  C: 70 millihenries*  

### AI Response: (may contain errors)  

When inductors are connected in series, their inductances add up directly. This is similar to how resistances add in series. The formula for the total inductance \( L_{\text{total}} \) of inductors in series is:

$$
L_{\text{total}} = L_1 + L_2 + \ldots + L_n
$$

In this question, you have two inductors:

- \( L_1 = 20 \) millihenries
- \( L_2 = 50 \) millihenries

To find the total inductance, simply add them together:

$$
L_{\text{total}} = 20 \, \text{mH} + 50 \, \text{mH} = 70 \, \text{mH}
$$

Therefore, the correct answer is 70 millihenries (Choice C).

**Why the other choices are incorrect:**

- **Choice A: 7 millihenries**  
  This value is much smaller than either of the individual inductances, which is not possible when adding inductors in series.

- **Choice B: 14.3 millihenries**  
  This value does not represent the sum of the two inductors. It seems to be a random number not related to the problem.

- **Choice D: 1,000 millihenries**  
  This value is significantly larger than the sum of the two inductors, which is not possible in this context.

Remember, for inductors in series, simply add their inductances to find the total inductance.