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43. 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 it

(c)   Iron at interior and aluminium surrounding it

(d)  Either (a) or (c)

Ans. b

(3)

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