Question

If $ {{I}_{1}} $ and $ {{I}_{2}} $ be the moment of inertia of two bodies of identical geometrical shape, the first is made of aluminium and second of iron, then

• A. $ {{l}_{1}}<{{l}_{2}} $
• B. $ {{l}_{1}}={{l}_{2}} $
• C. $ {{l}_{1}}>{{l}_{2}} $
• D. relation between $ {{l}_{1}} $ and $ {{l}_{2}} $ depends on the centrashapes of the bodies

Answer 1

Answer: (A)

The density of iron is greater than that of aluminium, so comparatively the similar size of aluminium has smaller mass than that of iron. Which implies $ {{I}_{1}} $ is smaller than $ {{I}_{2}}. $