Two discs of moments of inertia I 1 and I 2 about their respective axes (normal to the disc and passing through the centre), and rotating with angular speed ω 1 and ω 2 are brought into contact face to face with their axes of rotation coincident. Does the law of conservation of angular momentum apply to the situation?

Question

Two discs of moments of inertia I 1 and I 2 about their respective axes (normal to the disc and passing through the centre), and rotating with angular speed ω 1 and ω 2 are brought into contact face to face with their axes of rotation coincident. Does the law of conservation of angular momentum apply to the situation?, No, because the moments of inertia of the discs are different., Yes, because the discs have the same angular speed., Yes, because there is no net external torque on the system., No, because the axes of rotation are coincident.

MARKS App · Accepted Answer

Correct Option is : (C) Yes, because there is no net external torque on the system.

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