Soft iron is used for making electromagnet because it

Options

A. Magnetic permeability is high and retentivity and coercive force are small
B. Retentivity is high
C. Coericive force is high
D. Area of the hysteresis curve is large

Answer

To solve the question "Soft iron is used for making electromagnet because it", we need to analyze the properties of soft iron that make it suitable for use in electromagnets.

### Step-by-Step Solution:

1. **Understanding Electromagnets**: Electromagnets are created when an electric current passes through a coil of wire, generating a magnetic field. The strength of this magnetic field can be significantly increased by using a ferromagnetic material as a core.

2. **Properties of Soft Iron**: Soft iron is a type of ferromagnetic material that has specific properties making it ideal for electromagnets:
- **High Permeability**: Soft iron has a high magnetic permeability, which means it can easily become magnetized and allows magnetic field lines to pass through it efficiently. This property enhances the magnetic field produced by the coil.
- **Low Retentivity**: Soft iron has low retentivity, meaning it does not retain significant magnetization once the current is turned off. This allows for quick demagnetization, making it suitable for applications where the magnetic field needs to be switched on and off rapidly.
- **Low Hysteresis Loss**: Soft iron exhibits low hysteresis loss, which refers to the energy loss that occurs when the magnetic material is magnetized and demagnetized. This property ensures that the electromagnet operates efficiently without wasting energy.

3. **Conclusion**: Based on these properties, we can conclude that soft iron is used for making electromagnets primarily because of its high permeability, low retentivity, and low hysteresis loss.

4. **Identifying the Correct Statement**: If provided with multiple-choice options, we would select the option that states that soft iron has high permeability and low retentivity, as these are the key reasons for its use in electromagnets.