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A circular disc D 1 of mass M and radius R has two identical discs D 2 and D 3 of the same mass M and radius R attached rigidly at its opposite ends (see figure). The moment of inertia of the system about the axis OO' passing through the centre of D 1 as shown in the figure, will be : O' D 1 D 3 D 2 O

1. 3MR 2
2. MR 2
3. 2 MR 3 2
4. 2 MR 5 4

Correct answer: 3MR 2

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