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| Q. | The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is | 
| A. | mr2 / 2 | 
| B. | mr2 / 4 | 
| C. | mr2 / 6 | 
| D. | mr2 / 8 | 
| Answer» A. mr2 / 2 | |
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