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JEE Main2018PhysicsRotational MotionActual

A thin circular disk is in the x y plane as shown in the figure. The ratio of its moment of inertia about z and z ' axes will be:

Options

  1. A1 : 4
  2. B1 : 5
  3. C1 : 3
  4. D1 : 2

Correct answer

C. 1 : 3

Step-by-step solution

I Z =   m R 2 2 (by parallel axis theorem) I z ′ = 3 2 m R 2 I Z I z ′ = 1 3

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