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Magnetism And Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetism And Matter1 Mark
MCQ
The $B-H$ curve $(i)$ and $(ii)$ shown in fig., associated with:
  • A
    $(i)$ diamagnetic and $(ii)$ paramagnetic substance.
  • B
    $(i)$ paramagnetic and $(ii)$ ferromagnetic substance.
  • ✓
    $(i)$ soft iron and $(ii)$ steel respectively.
  • D
    $(i)$ steel and $(ii)$ soft iron respectively.
✓

Answer

Correct option: C.
$(i)$ soft iron and $(ii)$ steel respectively.
Retentivity of soft iron is more than steel but coercivity of steel is more.
Retentivity$-$the ability of a substance to retain or resist magnetization, frequently measured as the strength of the magnetic field that remains in a sample after removal of an inducing field.
Coercivity$-$the resistance of a magnetic material to changes in magnetization, equivalent to the field intensity necessary to demagnetize the fully magnetized material.

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