An round disc of moment of inertia I₂ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I ₁ rotating with an angular velocity about the same axis. The final angular vel

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An round disc of moment of inertia I₂ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I ₁ rotating with an angular velocity about the same axis. The final angular velocity of the combination of discs is:

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Correct answer: C. (I₁+I₂ ) I₁

From law of conservation of angular momentum we have: aligned & I₁ ₁= (I₁+I₂ ) ₂ & ₂= I₁ ₁ (I₁+I₂ ) = I₁ I₁+I₂ & aligned

An round disc of moment of inertia I₂ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia I ₁ rotating with an angular velocity about the same axis. The final angular velocity of the combination of discs is:

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