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A circular disc A of radius r is made from an iron plate of thickness t and another circular disc B of radius 4r is made from an iron plate of thickness t/4. The relation between the moments of inertia IA and IB is-

  1. A > B  
  2. A = B  
  3. A < B  
  4. depends on the actual values of t and r.  

The correct answer is: A < B

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