Q72 / 90 · JEE Main 2021 (24 Feb Shift 2) · Physics

A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains:

A
have no relation with external magnetic field.
B
decrease in size and changes orientation.
C
increase in size but no change in orientation.
Correct answer
D
may increase or decrease in size and change its orientation.

Solution

Soft ferromagnetic materials are materials which can be easily magnetised and demagnetised by external magnetic field. When external field is applied, the domains experiences a net torque hence change its orientation.

Hence, the correct answer is option: 'D'.

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