From a circular disc of radius 
and mass 
, a small disc of mass 
and radius 
is removed concentrically. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through its centre is
Text Solution
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: Mass of the disc 
Mass of removed portion of disc 
The moment of inertia of the complete disc about an axis passing through its centre 
and perpendicular to its plane is, 
Now, the moment of inertia of the disc with removed portion, 
Therefore, moment of inertia of the remaining portion of disc about centre 
is 
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