Question

The figure shows hysteresis curves for soft iron and stell.

1. Which among the two is the hysteresis loop of soft iron?

2. Which one among the two materials is preferred for use in transformers and galvanometers?

3. When steel is once magnetized, the magnetization is not easily destroyed even if it is exposed to strong reverse fields. Give reason.

Answer 1

1. Fig. b 

2. Soft iron 

3. When steel is magnetised the magnetic domains in the material is permanently set and magnetised permanently in the direction of the applied magnetic field.