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A circular disc is to be made using iron...

A circular disc is to be made using iron and aluminium. To keep its moment of inertia maximum about a geometrical axis, it should be so prepared that

A

Aluminium at interior and iron surround to it

B

Iron at interior and aluminium surround to it

C

Using iron and aluminium layers in alternate order

D

Sheet of iron is used at both external surface and aluminium sheet as interna layers

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The correct Answer is:
A
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