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A circular disc is to be made by using iron and aluminium so that it acquires maximum moment of inertia about geometrical axis. It is possible with

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Sheet of iron is used at both external surfaces and aluminium sheet as internal layer

Aluminium at interior and iron surrounding it,

Using iron and aluinium layers in alternate order

Iron at interior surrounded by aluminium

answer is A.

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Detailed Solution

As $I = {MR}^{2}$ , therefore, for maximum $I$ , heavier mass of iron should be at maximum distance from the centre $i . e .$ iron should surround aluminium.

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