MHT CET 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 interior and iron surrounding itCorrect
(C)iron at interior and aluminium surrounding it
(D)either 'a' and 'c'

Answer: (B)

Solution

is largest when the denser material (iron) is placed farthest from the axis, i.e. aluminium inside and

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Question ID VK-040198