*Question T5C04:
What is the unit of inductance?*  

*Correct Answer is  C: The henry*  

### AI Response: (may contain errors)  

The correct answer to the question about the unit of inductance is **C: The henry**.

### Explanation of the Correct Answer:
- **Henry (H)** is the standard unit of inductance in the International System of Units (SI). It is defined as the amount of inductance required to induce an electromotive force (EMF) of one volt when the current through the inductor changes at a rate of one ampere per second. 

### Why the Other Choices are Incorrect:
- **A: The coulomb**  
  - The coulomb (C) is the unit of electric charge, not inductance. It measures the quantity of electricity.

- **B: The farad**  
  - The farad (F) is the unit of capacitance, which measures a capacitor's ability to store charge. It is not related to inductance.

- **D: The ohm**  
  - The ohm (Ω) is the unit of electrical resistance. It measures how much a material opposes the flow of electric current, which is different from inductance.

### Useful Formulas:
- The relationship between inductance (L), voltage (V), current (I), and time (t) can be expressed as:
  
  $$ V = L \frac{dI}{dt} $$

  where:
  - $V$ = voltage across the inductor (volts)
  - $L$ = inductance (henries)
  - $I$ = current through the inductor (amperes)
  - $\frac{dI}{dt}$ = rate of change of current (amperes per second)

This formula illustrates how inductance relates to the voltage induced in an inductor due to a change in current. Understanding this relationship is crucial for grasping the concept of inductance in circuits.