Physics-
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Question

The moment of inertia of a thin square plate ABCD, of uniform thickness about an axis passing through the centre O and perpendicular to the plane of the plate is ( where I subscript 1 end subscript comma I subscript 2 end subscript comma I subscript 3 end subscript and I subscript 4 end subscript are respectively moments of inertia about axis 1, 2, 3 and 4 which are in the plane of the plate)

  1. I subscript 1 end subscript plus I subscript 2 end subscript    
  2. I subscript 3 end subscript plus I subscript 4 end subscript    
  3. I subscript 1 end subscript plus I subscript 3 end subscript    
  4. I subscript 1 end subscript plus I subscript 2 end subscript plus I subscript 3 end subscript plus I subscript 4 end subscript    

The correct answer is: I subscript 3 end subscript plus I subscript 4 end subscript

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