A circular disc X of radius R made from ...

A circular disc X of radius R made from iron plate of thickness 't' and another disc Y of radius 4R made from an iron plate of thickness `t/4`. Then the relation between the moments of inertia `I_(x) and I_(Y)` is

`I_(Y)=32 I_(X)`

`I_(Y)=16I_(X)`

`I_(Y)=I_(X)`

`I_(Y)=64I_(X)`

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