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Question

The M.I of a disc of mass M and radius R about an axis passing through the centre O and perpendicular to the plane of dise is fraction numerator M R to the power of 2 end exponent over denominator 2 end fraction If one quarter of the disc is removed the new moment of inertia of disc will be....

  1. fraction numerator M R to the power of 2 end exponent over denominator 3 end fraction    
  2. fraction numerator M R to the power of 2 end exponent over denominator 4 end fraction    
  3. fraction numerator 3 over denominator 8 end fraction M R to the power of 2 end exponent    
  4. fraction numerator 3 over denominator 2 end fraction M R to the power of 2 end exponent    

The correct answer is: fraction numerator 3 over denominator 8 end fraction M R to the power of 2 end exponent

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