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Question 20218
JEE Physics · Medium

Magnetism: Electromagnet Core Material MCQ

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Electromagnet Core MaterialMediumQuestion 20218

Question

Soft iron is preferred for electromagnet cores because it has:
  1. A
    High retentivity and high coercivity
  2. B
    Low retentivity and low coercivity
  3. C
    High permeability and low retentivity
    Correct
  4. D
    Low permeability and high coercivity

Correct answer

High permeability and low retentivity

Explanation

Electromagnet cores must be easily magnetised (high permeability/low coercivity) and easily demagnetised when the current stops (low retentivity). Soft iron satisfies both.

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