On keeping a paramagnetic material in a magnetic field, the magnetic flux density inside the material is likely to:

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  1. increase
  2. decrease
  3. reduce to zero
  4. remain the same

Answer (Detailed Solution Below)

Option 1 : increase
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Concept:

  • 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. 0 <  χ.
  • Example: Manganese, aluminum, chromium, platinum, etc.

Explanation:

  • When a paramagnetic substance is placed in a strong magnetising field, the magnetic field lines prefer to pass through the specimen rather than through air.
  • Thus magnetic induction inside the sample is more than the magnetic induction outside the sample

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Diamagnetic substances:

  • 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.


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.
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