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Magnetic Properties of Matter question

2021 · 24 Feb · Shift 2 · Q52
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  5. /2021 · 24 Feb · Shift 2 · Q52

Magnetic Properties of Matter question

2021 · 24 Feb · Shift 2 · Q52

JEE MainPhysicsMagnetic Properties of MatterMCQ+4 / −1
A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains :
  1. A
    may increase or decrease in size and change its orientation.
  2. B
    increase in size but no change in orientation.
  3. C
    decrease in size and changes orientation.
  4. D
    have no relation with external magnetic field.
View written solutionFree

Correct answer: A

  1. Concept of magnetic domains in a ferromagnetic material

    A ferromagnetic material consists of many small regions called magnetic domains. Inside each domain, magnetic moments are aligned in the same direction.

  2. What happens when an external magnetic field is applied?

    When a soft ferromagnetic material is placed in an external magnetic field:

    • Domains already aligned close to the external field direction grow in size.
    • Domains oppositely aligned or less favorably aligned may shrink in size.
    • Domain magnetic moments can also rotate/reorient toward the applied field.

    Since the material is soft ferromagnetic, domains can change easily under the applied field.

  3. Check each option

    Option A: may increase or decrease in size and change its orientation.
    This is correct, because favorable domains grow, unfavorable ones shrink, and domains may reorient.

    Option B: increase in size but no change in orientation.
    Incorrect. Orientation can also change.

    Option C: decrease in size and changes orientation.
    Incorrect. Some domains decrease, but others increase. So this is incomplete/wrong as a general statement.

    Option D: have no relation with external magnetic field.
    Incorrect. Domains respond strongly to the external field.

  4. Final answer

    Therefore, the correct option is:

    A\boxed{A}A​

  5. Comparison with stored correct answer

    Stored correct answer: A
    Derived answer: A
    Hence, they agree.

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