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A metallic rod when placed in strong magnetic field, aligns itself at right angles to the magnetic field. The nature of material is:
1. Diamagnetic
2. Paramagnetic
3. Ferromagnetic
4. Can be Ferromagnetic or Paramagnetic

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Correct Answer - Option 1 : Diamagnetic

Concept:

  • Diamagnetic Substance: Diamagnetic substances are those which develop feeble magnetization in the opposite direction of the magnetizing field.
  • Such substances are feebly repelled by magnets and tend to move from stronger to weaker parts of a magnetic field.
  • Magnetic susceptibility is small and negative i.e. -1 ≤ χ ≤ 0.
  • Examples: Bismuth, copper, lead, zinc, etc.
  • Paramagnetic substances: Paramagnetic substances are those which develop feeble magnetization in the direction of the magnetizing field.
    • Such substances are feebly attracted by magnets and tend to move from weaker to stronger parts of a magnetic field.
    • Magnetic susceptibility is small and positive i.e. χ > 0.
    • Example: Manganese, aluminium, chromium, platinum, etc.
  • Ferromagnetic substances: Ferromagnetic substances are those which develop strong magnetization in the direction of the magnetizing field.
  • They are strongly attracted by a magnet and tend to move from weaker to the stronger part of a magnetic field.
  • Magnetic susceptibility is very large and positive i.e. χ > 1000
  • Example: Iron, cobalt, nickel, gadolinium, and alloys like alnico.

Explanation:

  • From the above discussion, we can say that the diamagnetic material is repelled by a magnetic field
  • A diamagnetic material gets induced magnetization in a direction opposite to the magnetic field. It aligns itself in the direction of the weakest magnetic field.

So, A metallic rod when placed in strong magnetic field, aligns itself at right angles to the magnetic field. The nature of the material is diamagnetic.

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