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

Options

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 internal layers.

Answer

A

Explanation

Density of iron is greater than that of aluminium. If higher density material is surrounded by material of lower density then result moment of inertia would be maximum,