Two discs have same mass and thickness. Their materials are of densities d1 and d2. The ratio of their moments of inertia about an axis passing through the centre and perpnedicular to the plane is
A
d1:d2
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B
d2:d1
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C
(d1d2)
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D
(d2d1)2
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Solution
The correct option is Bd2:d1 (πR2td)=m ∴R2=mπtd Now, I=12mR2=m22πtd or I∝1d ∴I1I2=d2d1