JEE Main Physics question

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

(A)Iron and aluminium layers in alternate order
(B)Aluminium at the interior and iron surrounding itCorrect
(C)Iron at the interior and aluminium surrounding it
(D)Either (A) or (C)

Answer: (B)

Solution

Since for a given mass element, maximising requires placing the denser material

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Question ID VK-158958