*Question T5C03:
What describes the ability to store energy in a magnetic field?*  

*Correct Answer is  D: Inductance*  

### AI Response: (may contain errors)  

The correct answer to the question is **D: Inductance**.

### Explanation of the Correct Answer:
- **Inductance** is the property of an electrical component (usually a coil or inductor) that describes its ability to store energy in a magnetic field when an electric current flows through it. The amount of inductance is measured in henries (H).

### Why the Other Choices are Incorrect:
- **A: Admittance**  
  - Admittance is a measure of how easily a circuit allows current to flow, and it is the reciprocal of impedance. It does not relate to energy storage in a magnetic field.

- **B: Capacitance**  
  - Capacitance is the ability of a component (usually a capacitor) to store energy in an electric field, not a magnetic field. It is measured in farads (F).

- **C: Resistance**  
  - Resistance is a measure of the opposition to the flow of electric current in a circuit. It does not store energy; instead, it dissipates energy as heat.

### Useful Formulas:
- The energy ($E$) stored in an inductor can be calculated using the formula:
  
  $$E = \frac{1}{2} L I^2$$

  where:
  - $E$ = energy in joules (J)
  - $L$ = inductance in henries (H)
  - $I$ = current in amperes (A)

This formula illustrates how inductance relates to energy storage in a magnetic field, reinforcing why inductance is the correct answer.