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Question

Physics Question on Magnetism and matter

Out of soft iron and steel which has more coercivity, less retentivity.

A

iron

B

steel

C

both are equal

D

can't say

Answer

steel

Explanation

Solution

Coercivity:
Coercivity is the intensity of the applied magnetic field needed to reduce the magnetization of a material to zero. It represents the ability of a ferromagnetic material to resist becoming demagnetized in the presence of an external magnetic field.
Retentivity:
Retentivity is the ability of a material to retain magnetism after the magnetizing force is removed. It refers to the property of a magnetic material to maintain a certain level of magnetism even when the external magnetizing field is reduced to zero.
Since steel requires a stronger magnetic field to reduce its magnetization to zero, it has higher coercivity and lower retentivity compared to soft iron.
So, the correct option is B: Steel.