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Magnetic Properties of Matter question

2022 · 24 Jun · Shift 2 · Q52
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  5. /2022 · 24 Jun · Shift 2 · Q52

Magnetic Properties of Matter question

2022 · 24 Jun · Shift 2 · Q52

JEE MainPhysicsMagnetic Properties of MatterMCQ+4 / −1
The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has
  1. A
    low coercivity and high retentivity.
  2. B
    low coercivity and low permeability.
  3. C
    high permeability and low retentivity.
  4. D
    high permeability and high retentivity.
View written solutionFree

Correct answer: C

  1. What properties are needed for an electromagnet?

    An electromagnet should:

    • become strongly magnetized when current flows,
    • lose its magnetism quickly when current is switched off.

    Therefore, the core material should have:

    • high permeability ⇒\Rightarrow⇒ it gets magnetized easily,
    • low retentivity ⇒\Rightarrow⇒ it does not retain magnetism strongly after the field is removed.

  2. Role of coercivity

    Soft iron also has low coercivity, which means it can be demagnetized easily. This is consistent with electromagnet use.

  3. Check the options

    • A: low coercivity and high retentivity
      High retentivity is not suitable for an electromagnet, because the core would remain magnetized. So this is incorrect.

    • B: low coercivity and low permeability
      Low permeability is not suitable, because the material would not magnetize strongly. So this is incorrect.

    • C: high permeability and low retentivity
      This matches the required properties for an electromagnet. So this is correct.

    • D: high permeability and high retentivity
      High retentivity is not desirable for an electromagnet. So this is incorrect.

  4. Final answer

    The correct option is: C: high permeability and low retentivity\boxed{\text{C: high permeability and low retentivity}}C: high permeability and low retentivity​

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