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Consider two uniform discs of the same thickness and different radii R₁= R and R₂ =αR made of the same material. If the ratio of their moments of inertia I₁ and I₂, respectively, about their axes is I₁: I₂ = 1 : 16 then the value of α is

1) √2

2) 2

3) 2√2

4) 4

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