A uniform circular disc of radius ‘R’ and mass ‘M’ is rotating about an axis perpendicular to its plane and passing through its centre. A small circular

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🧑‍🏫 Author: Aditya Bhatt Sir   |   🕒 Last Updated: July 13, 2025

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📘Question

A uniform circular disc of radius ‘R’ and mass ‘M’ is rotating about an axis perpendicular to its plane and passing through its centre. A small circular part of radius R/2 is removed from the original disc as shown in the figure. Find the moment of inertia of the remaining part of the original disc about the axis as given above.

                                                                (JEE-2025)   

✅ Answer

Ans. (4)

A uniform circular disc of radius ‘R’ and mass ‘M’ is rotating about an axis perpendicular to its plane and passing through its centre. A small circular part of radius R/2 is removed from the original disc as shown in the figure. Find the moment of inertia of the remaining part of the original disc about the axis as given above.

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