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Electro-Magnetism — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsElectro-Magnetism1 Mark
MCQ
Why in permanent magnet steel is used instead of soft iron?
  • ✓
    Retentivity of steel is higher than soft iron.
  • B
    Retentivity of steel is lower than soft iron.
  • C
    Ductility of steel is lower than soft iron.
  • D
    Ductility of steel is higher than soft iron.
✓

Answer

Correct option: A.
Retentivity of steel is higher than soft iron.
(a)
Retentivity of steel is higher than soft iron.
Explanation:
As retentivity of steel is higher than soft iron, thus once it is magnetised, it does not quickly lose its magnetism.

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