Name the physical quantity which is measured in weber `amp^(-1)` .

Options

A. self inductance
B. mutual inductance
C. magnetic flux
D. both (a) and (b)

Answer

To solve the question, we need to identify the physical quantity that is measured in the unit of weber per ampere (Wb/A), which is equivalent to Henry (H).

### Step-by-Step Solution:

1. **Understanding the Units**:
- The unit weber (Wb) is the unit of magnetic flux.
- The unit ampere (A) is the unit of electric current.
- Therefore, weber per ampere (Wb/A) can be interpreted as a measure of how much magnetic flux is associated with a unit of electric current.

2. **Identifying the Physical Quantity**:
- The physical quantity that relates magnetic flux to electric current is **inductance**.
- There are two types of inductance:
- **Self Inductance**: This is the property of a coil or circuit that allows it to induce an electromotive force (emf) in itself due to a change in current.
- **Mutual Inductance**: This is the property of a coil or circuit that allows it to induce an emf in another coil or circuit due to a change in current in the first coil.

3. **Units of Inductance**:
- The unit of inductance is the Henry (H).
- One Henry is defined as the inductance in which a change of current of one ampere per second induces an emf of one volt.
- Mathematically, 1 H = 1 Wb/A.

4. **Conclusion**:
- Hence, the physical quantities measured in weber per ampere (Wb/A) are **self inductance** and **mutual inductance**. Both are measured in Henry (H).

### Final Answer:
The physical quantities measured in weber per ampere (Wb/A) are **self inductance** and **mutual inductance**, both of which are measured in Henry (H).

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