Rotational MotionHard

Question

Four similar point masses (each of mass m) are placed on the circumference of a disc of mass M and radius R. The M.I. of the system about the normal axis through the centre O will be : -
                                                      

Options

A.MR2 + 4mR2
B.MR2 + 4mR2
C.MR2 + mR2
D.None of these

Solution

MI of disc about the axis at O & Perpendicular to
plane is = MI of four particle is = mR2 × 4
                           
∴ Total MI = + 4mR2

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