Question

Let $I_{1}$ and $I_{2}$ be the moments of inertia of two bodies of identical geometrical shape, the first made of aluminium and the second of iron then for a given axis of rotation :

• A. $I_{1}
• B. $I_{1}=I_{2}$
• C. $I_{1}>I_{2}$
• D. Relation between $I_{1}$ and $I_{2}$ depends on the actual shapes of the bodies.

Answer 1

Answer: (A)

For identical geometrical shape the mass of iron body will be more than that of aluminimum body hence moment of inertia of iron body will be more as expression for moment of inertia for both bodies will be same for same axis of rotation.