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  4. Assertion Moment of inertia of circular ring about a given axis is more than moment of inertia of the circular disc of same mass and same size, about the same axis. Reason The circular ring hollow so its moment of inertia is more than circular disc which is solid.

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Q. Assertion Moment of inertia of circular ring about a given axis is more than moment of inertia of the circular disc of same mass and same size, about the same axis.
Reason The circular ring hollow so its moment of inertia is more than circular disc which is solid.

System of Particles and Rotational Motion

Solution:

In the case of circular ring the mass is concentrated on the rim (at maximum distance from the axis) therefore moment of inertia increase as compared to that in circular disc.