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  4. Two dises of same mass and different radii are made of different materials such that their thicknesses are 1 cm and 0.5 cm respectively. The densities of materials are in the ratio 3: 5. The moment of inertia of these dises respectively about their diameters will be in the ratio of (x/6). The value of x is

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Q. Two dises of same mass and different radii are made of different materials such that their thicknesses are $1 \,cm$ and $0.5 \,cm$ respectively. The densities of materials are in the ratio $3: 5$. The moment of inertia of these dises respectively about their diameters will be in the ratio of $\frac{x}{6}$. The value of $x$ is ___

JEE MainJEE Main 2023System of Particles and Rotational Motion

Solution:

Correct answer is '5'