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Magnetic Properties of Matter question

2023 · 8 Apr · Shift 2 · Q51
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  5. /2023 · 8 Apr · Shift 2 · Q51

Magnetic Properties of Matter question

2023 · 8 Apr · Shift 2 · Q51

JEE MainPhysicsMagnetic Properties of MatterMCQ+4 / −1
Given below are two statements: one is labelled as Assertion A\mathbf{A}A and the other is labelled as Reason R\mathbf{R}R Assertion A : Electromagnets are made of soft iron. Reason R : Soft iron has high permeability and low retentivity. In the light of above, statements, choose the most appropriate answer from the options given below.
  1. A
    Both A and R are correct and R is the correct explanation of A
  2. B
    A is not correct but R is correct
  3. C
    A is correct but R is not correct
  4. D
    Both A and R are correct but R is NOT the correct explanation of A
View written solutionFree

Correct answer: A

  1. Understand the assertion

    Assertion AAA: Electromagnets are made of soft iron.

    This is correct. In an electromagnet, we want the core to become strongly magnetized when current flows, and to lose magnetism quickly when current is switched off.

  2. Understand the reason

    Reason RRR: Soft iron has high permeability and low retentivity.

    This is also correct.

    • High permeability means soft iron is easily magnetized, so it produces a strong magnetic field.
    • Low retentivity means it does not retain magnetism for long after the current is removed, which is desirable for an electromagnet.

  3. Check whether the reason explains the assertion

    Yes, it does.

    Electromagnets are made of soft iron because soft iron:

    • gets magnetized easily (high permeability)(\text{high permeability})(high permeability),
    • loses magnetism quickly when current is turned off (low retentivity)(\text{low retentivity})(low retentivity).

    Hence, the reason correctly explains why soft iron is used in electromagnets.

  4. Choose the correct option

    Therefore, both A and R are correct and R is the correct explanation of A.

    So, the correct option is: A\boxed{A}A​

  5. Comparison with stored answer

    Stored correct answer: AAA

    Our derived answer matches the stored answer.

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