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NEET2019PhysicsRotational MotionActual

The radius of gyration of a thin uniform circular disc (of radius R ) about an axis passing through its centre and lying in its plane is

Options

  1. AR
  2. BR / 2
  3. CR / 4
  4. DR / 2

Correct answer

D. R / 2

Step-by-step solution

Moment of inertia of the thin uniform circular disc of mass M and radius R about an axis passing through its centre and lying in its plane (i.e., about its diameter) is From (i) and (ii), we get k^2= R^2 4 or k= R 2

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