# From a circular disc of radius R and mass 9M, a small disc of mass M and radius R/3 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 center isOption 1) (40/9) MR2                                                                                                      Option 2) MR2 Option 3) 4 MR2                                                                                            Option 4)

Initial moment of inertia of the complete disc about an axis passing through its centre and perpendicular to its plane is

moment of inertia of disc removed, about an axis passing through its centre and perpendicular to its plane is

moment of inertia of the remaining portion of the disc =

Hence correct option is 1.

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