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Q.

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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a

Aluminium at interior and iron surrounding it,

b

Iron at interior surrounded by aluminium

c

Using iron and aluinium layers in alternate order

d

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

answer is A.

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Detailed Solution

AsI=MR2 , therefore, for maximumI , heavier mass of iron should be at maximum distance from the centre i.e.  iron should surround aluminium.
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