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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 geometrical axis. It is possible with

A

aluminium at interior and iron surround to it

B

iron at interior and aluminium surround to it

C

using iron and aluminiuml layers in alternate order

D

sheet of iron is used at both external surfaces and aluminium sheet as internal layers.

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The correct Answer is:
A
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