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(B) The hysteresis loop represents the relationship between the intensity of magnetisation $I$ and the magnetising field $H$. Curve $A$ has a larger a

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Steel and soft iron respectively

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(B) The hysteresis loop represents the relationship between the intensity of magnetisation $I$ and the magnetising field $H$. Curve $A$ has a larger area and a larger intercept on the $H$-axis (coercivity) compared to curve $B$. Materials with high coercivity and high retentivity are used to make permanent magnets,such as steel. Materials with low coercivity and high permeability are used to make electromagnets,such as soft iron. Therefore,curve $A$ corresponds to steel and curve $B$ corresponds to soft iron.

The intensity of magnetisation $I$ is plotted against the magnetising field $H$ for different substances. The curves $A$ and $B$ shown in the adjoining figure are associated with

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