Question

Soft iron used to make the core of transformer, because of its :

• A. low coercivity and high retentivity
• B. high coercivity and low retentivity
• C. high coercivity and high retentivity
• D. low coercivity and low retentivity

Answer 1

The correct option is D low coercivity and low retentivity

Soft iron has low retentivity and low coercivity.

The core of a transformer undergoes rapid cycles of magnetization and demagnetization, during its working.

If a material has larger retentivity and coercivity, then a large amount of energy will be lost to demagnetize the substance, in each and every cycle.

To minimise this loss, the material must have low retentivity and corecievity.

Hence, option $\left(D\right)$ is the correct answer.