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Question: Answered & Verified by Expert
A thin rod of length $L$ and mass $M$ is bent at its midpoint into two halves so that the angle between them is $90^{\circ}$. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is
PhysicsRotational MotionJEE Main
Options:
  • A $\frac{\sqrt{2} M L^2}{24}$
  • B $\frac{M L^2}{24}$
  • C $\frac{M L^2}{12}$
  • D $\frac{M L^2}{6}$
Solution:
1079 Upvotes Verified Answer
The correct answer is: $\frac{M L^2}{12}$
Distribution of masses about axis of rotation remain unchanged whether it is straight or bend.
$$
I=\frac{M L^2}{12}
$$

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