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JEE Main 2014 · 11 Apr · Shift 1, Physics question 20

Three identical bars A, B and C are made of different magnetic materials. When kept in a uniform magnetic field, the field lines around them look as follows :

Make the correspondence of these bars with their material being diamagnetic (D), ferromagnetic (F) and paramagnetic (P) :

Field lines near three bars in a uniform field: around A the lines crowd strongly into the bar; around B they bend away and avoid the bar; around C they pass through with only slight crowding.
Choose one option
Answer and worked solution

Official answer: B

  • Field lines crowd strongly into A: ferromagnetic.
  • They are pushed out of B: diamagnetic.
  • They are drawn slightly into C: paramagnetic.

So A ↔ F, B ↔ D, C ↔ P.

Topics:Magnetic materials
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