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Question 20217
JEE Physics · Medium

Magnetism: Permanent Magnet Material MCQ

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Permanent Magnet MaterialMediumQuestion 20217

Question

For a permanent magnet, the ideal material should have:
  1. A
    High retentivity and low coercivity
  2. B
    Low retentivity and high coercivity
  3. C
    High retentivity and high coercivity
    Correct
  4. D
    Low retentivity and low coercivity

Correct answer

High retentivity and high coercivity

Explanation

A permanent magnet needs high retentivity (to maintain strong B when H = 0) and high coercivity (to resist demagnetisation). Steel and Alnico alloys qualify.

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