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JEE Physics · Medium

Rigid Body Dynamics: MOI — Parallel Axis MCQ

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MOI — Parallel AxisMediumQuestion 30322

Question

The MOI of a disc (mass M, radius R) about a tangential axis in its plane is:
  1. A
    MR²/4 + MR²
    Correct
  2. B
    MR²/2 + MR²
  3. C
    MR²/4 + MR²/4
  4. D
    MR²

Correct answer

MR²/4 + MR²

Explanation

Tangential in plane: I_cm (in plane) = MR²/4. Parallel axis distance = R. I = MR²/4 + MR² = 5MR²/4.

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