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NEET 2004 (AIPMT) · Angular Momentum & its Conservation

Angular Momentum & its Conservation question from NEET 2004 (AIPMT)

Q92NEET 2004 · AIPMTMedium

Angular Momentum & its Conservation

A round disc of moment of inertia $I$ 2 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 $\omega$ about the same axis. The final angular velocity of the combination of discs is

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Answer: (c)

No external torque, so $I_1\omega = (I_1+I_2)\omega'$ .
$\omega' = \frac{I_1\omega}{I_1+I_2}$
So the answer is (c) $\frac{I_1\omega}{I_1+I_2}$ .

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