System of Particles and Rotational Motion - Result Question 63
70. There is a flat uniform triangular plate $A B C$ such that $A B=4 cm, B C=3 cm$ and angle $A B C=$ $90^{\circ}$. The moment of inertia of the plate about $A B, B C$ and $C A$ as axis is respectively $I_1, I_2$ and $I_3$. Which one of the following is true?[2000]
(a) $I_3>I_2$
(b) $I_2>I_1$
(c) $I_3>I_1$
(d) $I_1>I_2$
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Answer:
Correct Answer: 70. (b)
Solution:
- (b)
If we choose $B C$ as axis. Distance is maximum. Hence, Moment of Inertia is maximum.
Moment of Inertia depend upon mass and distribution of masses as $I=\Sigma m r^{2}$.
Further, as the distance of masses is more, more is the moment of Inertia.
$\therefore I_2>I_1, I_2>I_3$
