Question

Two discs of same mass and same thickness (t) are made from two different materials of densities $d_{1}$ and $d_{2}$ respectively. The ratio of the moment of inertia $I_{1}$ to $I_{2}$ of two discs about an axis passing through the centre and perpendicular to the plane of disc is

• A. $d_{1}:d_{2}$
• B. $d_{2}:d_{1}$
• C. $1:d_{1}d_{2}$
• D. $1:d_{1}^2d_{2}$

Hint:

Logic Tip: A denser material will have a smaller radius for the same mass, leading to a smaller moment of inertia.

Answer 1

The Correct Option is B