NEETPhysicsRotational Motion
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?
Options
- ANo, because the moments of inertia of the discs are different.
- BYes, because the discs have the same angular speed.
- CYes, because there is no net external torque on the system.
- DNo, because the axes of rotation are coincident.
Correct answer
C. Yes, because there is no net external torque on the system.
Step-by-step solution
Correct Option is : (C) Yes, because there is no net external torque on the system.