A circular disc is to be made by using i...

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

aluminimum is at the interior and iron surrounds it

iron is at the interior and aluminimum surrrounds it

aluminium and iron layers are in alternate order

sheet of iron is used at both external surfaces and aluminium sheet as inner material

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