Two circular discs A and B are of equal masses and thickness but made of metal with densities dA and dB(dA>dB). If their moments of inertia about an axis passing through their centres and perpendicular to circular faces are IA and IB, then
A
IA=IB
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B
IA>IB
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C
IA<IB
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D
IA≥IB
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Solution
The correct option is CIA<IB
Step 1: Moment of inertia of circular discs [Ref. Fig.]
Moment of inertia of circular discs about an axis passing through their centres and perpendicular to circular faces: