Soft iron is used in many electrical machines for:

Options

A. Low hystenests loss and low permeability
B. Low hysteresis loss and high permeability
C. High hysteresis loss and low permeability
D. High hysteresis loss and high permeability

Answer

To understand why soft iron is used in many electrical machines, we can break down the reasoning into the following steps:

### Step-by-Step Solution:

1. **Definition of Soft Iron**:
Soft iron is a type of ferromagnetic material that is characterized by its high magnetic permeability and low hysteresis loss.

2. **Understanding Hysteresis Loss**:
Hysteresis loss refers to the energy lost in a magnetic material when it is magnetized and demagnetized. This loss occurs due to the lag between the magnetization and the external magnetic field. Soft iron has low hysteresis loss, meaning it loses less energy during these processes.

3. **High Permeability**:
Permeability is a measure of how easily a material can become magnetized or how well it can conduct magnetic lines of force. Soft iron has high permeability, which allows it to respond quickly and effectively to external magnetic fields.

4. **Application in Electrical Machines**:
Due to its low hysteresis loss, soft iron minimizes energy losses in electrical machines, making them more efficient. Additionally, its high permeability ensures that the machines can operate effectively under varying magnetic conditions.

5. **Conclusion**:
Therefore, soft iron is used in many electrical machines primarily because it has low hysteresis loss and high permeability, which contribute to the efficiency and performance of these machines.

### Final Answer:
Soft iron is used in many electrical machines for its low hysteresis loss and high permeability.

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